OPINION OF THE COURT

JORDAN, Circuit Judge.

Joseph R. Lee was convicted in the United States District Court for the Western District of Pennsylvania of being a felon in possession of a firearm, in violation of 18 U.S.C. § 922(g)(1), and was sentenced as a career offender to 120 months' imprisonment. He appeals both the conviction and his sentence. For the following reasons, we will affirm Lee's conviction but vacate his sentence and remand for re-sentencing.

I. Background

A. The Stop

On June 27, 2005, Lieutenant Kevin Kraus of the City of Pittsburgh Police Department traveled to the 2400 block of Webster Avenue in the Hill District of Pittsburgh, Pennsylvania to investigate a homicide that had occurred there the day before. Kraus was in an unmarked police car when he observed Lee, driving a blue Jeep Grand Cherokee, run a stop sign.

Kraus activated his siren and followed Lee to stop him for the traffic violation. Lee abruptly pulled over, and, according to Kraus, began making "rapid, suspicious movements," and reaching "down towards his torso area" as Kraus approached the car on foot. ( Id. at 349.) All of the windows of the Jeep were down and the sunroof was open. Kraus scanned the car, and noticed a "rather large black heavy coat . . . [with] a distinctive flap on the top" in the backseat of the Jeep. ( Id. at 351.) He also noticed that the coat "appeared to be partially wrapped around . . . a long, narrow object." ( Id. at 351-52.) He took particular note of the coat because the temperature was over 90 degrees that day. Kraus further observed that Lee was wearing a tan bullet-proof vest and was not wearing a shirt. Lee volunteered that he had been trying to take off the bullet-proof vest. Kraus ordered him to raise his hands above his head and place them where Kraus could see them. According to Kraus, at that moment, he saw what he believed to be a black semi-automatic pistol lying on Lee's right thigh. After seeing the object, Kraus drew his own gun and told Lee: "Get your hands in the air. Don't move." ( Id. at 353-54.) In response, Lee grabbed the steering wheel, said that he had to go, and sped away from the scene.

Kraus called the police dispatcher, reported that he had an emergency, and provided a description of Lee and the Jeep. Shortly thereafter, Kraus learned that another officer had found a Jeep Grand Cherokee matching the description of Lee's car. It was in a parking lot at the rear of the Christopher A. Smith Terrace Apartments (the "Apartments"), about a tenth of a mile from where Kraus had stopped Lee. Lee later stipulated that he abandoned the Jeep where the police found it.

B. The Search

Kraus went to the parking lot at the Apartments and identified the Jeep as the one that he had earlier stopped and in which Lee had fled. All the windows were still down and the sunroof remained open. The bullet-proof vest was lying on the passenger side of the vehicle. However, the coat and long slender object that Kraus remembered seeing in the backseat were no longer there. Four other officers were at the scene to aid Kraus in the investigation. During a search of the area, one of them, Kevin Faulds, found an AK-47 assault rifle beside a fence separating the Apartments from the next door Francis Court Housing Complex (the "Housing Project"). Kraus joined Faulds by the fence and observed the AK-47 partially covered in a black coat with a distinctive flap, lying against the fence. Kraus identified the black coat as the one he had seen in Lee's Jeep.

A police bloodhound named Digger and his handler, Officer Rudolph Harkins, soon arrived at the scene. Kraus informed Harkins that the other officers had already located the Jeep, rifle, and coat. Harkins gave Digger the scent of the Jeep's driver by wiping the driver's seat with a swab, offering the swab for Digger to smell, and giving the dog a command to track the scent. Digger then went down a flight of steps, through a parking lot, and came to within ten to fifteen inches of the rifle and the coat. According to Harkins, Digger then "veered to the right along the fence, [and] went down the fence line approximately 20, 25 feet." (App. at 458.) Digger found an area of the fence that had been ripped open, went through the opening, and continued towards the Housing Project on the other side of the fence. He stopped in front of the door of a vacant building in the Housing Project, and, at that point, circled and sat down, indicating that he had lost the scent. The building was searched, but Lee was not found.

C. The Arrest

Approximately two weeks later, on July 12, 2005, Kraus learned that fellow police officers had caught sight of and were pursuing Lee. They finally found him hiding in an apartment. No weapons or contraband were found on Lee at the time of his arrest, nor in the apartment where he was found. The police arrested him, took him to an interview room at the police station, and gave him Miranda warnings. He signed a form waiving his Miranda rights, and Kraus proceeded to interview him. Lee denied having any guns in his car when Kraus stopped him. However, he acknowledged that he had been wearing a bulletproof vest. He said that he had started to take off the vest as Kraus approached the car because he wanted to create a diversion so that Kraus would not see a bag of marijuana that was in the car. Lee further explained that he drove away when Kraus drew his gun because he thought Kraus had drawn the gun in reaction to seeing the bag of marijuana. Kraus told Lee that he had not seen any marijuana but rather had seen a black semi-automatic pistol on Lee's lap. Lee responded that what Kraus had seen was actually a "black and silver cell phone flip-style open and extended on his lap." (App. at 414.)

According to Kraus, Lee "insisted that he does not typically own or carry guns. However, he did state that he had access to a lot of guns and would use them against anyone who threatens him or his family." ( Id. at 417.) Lee also said that he had previously shot at a man named Ernest "Pickles" Harris and that there was a "long time, ongoing violent feud" between their two families. ( Id.) Finally, while Lee insisted that he did not have any weapons with him during the traffic stop two weeks earlier, he admitted fleeing when Kraus had tried to stop him on an earlier occasion in 2000 or 2001 when Lee did have guns in a vehicle.

D. Procedural History

On May 3, 2006, a grand jury in the Western District of Pennsylvania returned a one-count indictment charging Lee with being a felon in possession of two firearms, a rifle and a pistol, in violation of 18 U.S.C. § 922(g)(1). The rifle referred to in the indictment is the AK-47 that was found lying by the fence under a black coat, near the location of Lee's abandoned car. The pistol is what Kraus had allegedly seen on Lee's lap, although no such pistol was ever recovered.

Prior to trial, Lee filed several motions, including a motion to suppress audio tapes of his interviews, a motion to exclude the bloodhound evidence and for a Daubert hearing to test the admissibility of that evidence, a motion under Rule 404(b) to exclude the evidence of the bullet-proof vest and Lee's interview statements to Kraus, and a motion for judgment of acquittal with regard to the pistol on the jurisdictional ground that the pistol was not a firearm in or affecting interstate commerce. With the exception of a limited portion of the 404(b) motion that is not relevant to this appeal, the District Court denied all of Lee's motions.

At trial, over Lee's objection, the government introduced the statements that Lee made during his interview with Kraus and evidence that Lee was wearing a bullet-proof vest when he was stopped. Additionally, over objection, the dispatch tapes were played, and a transcript was provided to the jury. Finally, over objection, the District Court admitted evidence of Digger's efforts to track Lee. However, in light of a dispute over whether Digger had alerted at the coat and rifle, the Court noted that the government "agreed to eliminate any reference in the testimony that Digger paused" when he reached them. (App. at 2.)

At the close of the government's case, Lee moved for judgment of acquittal with respect to his alleged possession of the pistol. Even assuming that what Kraus had seen was a pistol, Lee argued, there was no evidence that the pistol had ever traveled in interstate commerce, as is required under 18 U.S.C. § 922(g). The Court denied the motion, and denied it again when defense counsel renewed it at the close of all evidence.

Throughout trial, Lee's defense with regard to the rifle was that it had never been in his Jeep and that he was not the person who disposed of it. Specifically, "[t]he defense (1) attacked the reliability of [Kraus's] observations, (2) offered evidence that others had an opportunity to have hidden the rifle in that crime-ridden area, . . . and (3) stressed the complete absence of physical evidence tying Lee to the weapon and coat." (Appellant's Op. Br. at 63.)

The District Court instructed the jury that a conviction could be based on a finding that Lee possessed either a pistol, or a rifle, or both. The Court and the prosecutor told the jury that unanimity was required on any finding of possession as to either weapon, and jury interrogatories treated each weapon as a separate basis of criminal liability. On June 19, 2008, the jury found Lee guilty of possessing the rifle but not guilty of possessing the pistol. The Court subsequently sentenced Lee to 120 months of imprisonment, to be followed by a three-year term of supervised release, and a special assessment of $100. Lee filed a timely notice of appeal, challenging both his conviction and his sentence.

II. Discussion

Lee advances six arguments on appeal: first, that "the rifle charge was prejudicially tainted by evidence offered to support the improper . . . [pistol] charge" (Appellant's Op. Br. at 19); second, that the District Court erred in allowing the government to introduce evidence that he was wearing a bullet-proof vest at the time he was stopped by Kraus; third, that the District Court erred in allowing Kraus to testify about the interview statements Lee made regarding prior weapons possession; fourth, that the prosecutor committed misconduct during his discussion of Digger, the bloodhound; fifth, that the District Court erred at sentencing by classifying Lee's state misdemeanor conviction for reckless endangerment as a crime of violence, thereby increasing the length of his sentence; and, sixth, that the felon-in-possession statute is unconstitutional. We address each argument in turn.

A. Prejudicial Spillover

Lee argues that the District Court erred in denying his motion for judgment of acquittal on the pistol charge because there was insufficient evidence that the pistol, even if he had one, traveled in interstate commerce, which is a required element under 18 U.S.C. § 922(g). Although Lee was ultimately acquitted of the pistol charge, he contends that the District Court's error in permitting that charge to go to the jury entitles him to a new trial on the rifle charge, because the rifle charge was prejudicially "tainted" by evidence submitted to support the pistol charge. (Appellant's Op. Br. at 25.) In other words, Lee contends that there was prejudicial spillover from one charge to the other.

i. Standard of Review

The parties begin with a debate about the standard of review we should apply when evaluating a claim that one criminal charge has tainted the jury's consideration of another. Lee argues that we should apply the test articulated in United States v. Pelullo, 14 F.3d 881 (3d Cir. 1994), in which we stated that, "[w]hen confronted with a problem of taint, we must `consider whether the presence of the [invalidated] count had any spillover effect sufficiently prejudicial to call for reversal.'" Id. at 897-98 (quoting United States v. Ivic, 700 F.2d 51, 65 (2d Cir. 1983)). We must reverse and allow for a new trial if the jury was "probably influenced," id. at 900, or "`was likely to be confused or relied upon improper evidence' in its deliberations on the remaining counts." United States v. Murphy, 323 F.3d 102, 122 (3d Cir. 2003) (quoting Pelullo, 14 F.3d at 898). Even though Lee raised the invalidity of the pistol charge at trial, the government, citing United States v. Wright, 363 F.3d 237 (3d Cir. 2004), argues that plain error review applies because Lee did not argue prejudicial spillover before the District Court "in any relevant pleading, such as in a motion for a new trial." (Appellee's Ans. Br. at 3.)

The debate is misleading, as it seems to proceed from the mistaken presumption that the test articulated in Pelullo is a standard of appellate review. It is not. Rather, it is an analytical approach to assessing whether evidence from one charge unfairly affected consideration of another charge. In particular, we are here tasked with assessing whether what happened — an acquittal on the pistol charge after hearing evidence on it — means that the jury could not have fairly addressed the rifle charge. To answer that question, we employ the Pelullo test.

However, acknowledging that Pelullo must be applied to evaluate a claim of taint still leaves us to determine what standard of review to employ in a case like this, in which the issue of taint was never raised before the District Court. This appears to be an issue of first impression for us, and so we look to how we address challenges to the sufficiency of evidence as a guide for the appropriate appellate role in appraising post-hoc complaints about a verdict's basis. Somewhat like an insufficiency of the evidence argument, an argument of taint asserts that, once the allegedly tainted material is removed from the jury's calculus, there is no sound basis to support the remaining charge.

When a sufficiency of evidence challenge has first been made in the District Court, we exercise plenary review on appeal and ask specifically "whether there is substantial evidence that, when viewed in the light most favorable to the government, would allow a rational trier of fact to convict." United States v. Bornman, 559 F.3d 150, 152 (3d Cir. 2009) (quotations and citations omitted). Though plenary, the "standard of review is highly deferential." Id. However, where a defendant does not mount a challenge to the sufficiency of the evidence in the District Court, we review for plain error. United States v. Guadalupe, 402 F.3d 409, 410 n. 1 (3d Cir. 2005). Analogizing to that standard, we hold that, because Lee did not raise the issue of taint in the District Court, we must evaluate his claim of taint — through application of the Pelullo test — under a plain error standard of review.

As discussed below, we conclude that Lee's claim of taint fails under Pelullo, even when employing the more generous plenary standard of review. Accordingly, we have no difficulty concluding that his claim does not succeed under plain error review.

ii. The Merits of the Prejudicial Spillover Argument

The government contends that Lee's prejudicial spillover argument fails for two reasons. First, the government says that the District Court did not err when it denied Lee's motion for judgment of acquittal as to the pistol charge because there was sufficient evidence to allow that charge to go to the jury. Second, the argument continues, even assuming that the Court erred in denying Lee's motion, the rifle conviction can stand because there was no prejudicial spillover of evidence from the pistol charge.

The government's insistence that there was sufficient evidence to support the pistol charge is not its most persuasive argument. Indeed, it might have been the better part of wisdom not to have pressed for that charge to go to the jury. The pistol was never recovered, and the testimony about its make and, in turn, about whether it had traveled in interstate commerce, turned out to be a bit equivocal. However, we need not address whether it was error to send the pistol charge to the jury because, even assuming it was, the government is correct that no prejudicial taint from that charge spilled over into the jury's consideration of the rifle charge.

An analysis of whether there was prejudicial spillover involves two inquiries. See United States v. Cross, 308 F.3d 308, 318 (3d Cir. 2002). First, if "the evidence to prove the overturned count would have been admissible to prove the remaining valid count, the defendant was not prejudiced, and there is no need to consider whether the evidence influenced the outcome." Id. In other words, if, in creating a hypothetical trial as to the valid count only, the evidence of the invalidated count would have been admissible anyway, the analysis ends there. Id. If the evidence would not have been admissible, "then we must consider whether the verdict on the remaining count was affected adversely by the evidence that would have been inadmissible at a trial limited to that count." Id. "Generally, invalidation of the convictions under one count does not lead to automatic reversal of the convictions on other counts." United States v. Gambone, 314 F.3d 163, 180-81 (3d Cir. 2003) (citing Pelullo, 14 F.3d at 897).

As to whether evidence regarding the pistol charge would have been admissible in a trial only about Lee's possession of the rifle, Lee asserts that, had the District Court properly granted him a judgment of acquittal on the pistol charge, evidence relating to the pistol would have been stricken. According to Lee, the only reason for allowing evidence of Kraus's belief that he saw a pistol "would be to demonstrate Lee's propensity to carry firearms . . . i.e., a person who carries a pistol on his lap is the type of person who also transports a rifle in his back seat." (Appellant's Op. Br. at 31.) Admission of such propensity evidence, Lee argues, is precisely what Rule 404(b) "is intended to prevent." Id. However, even if we assume that evidence regarding the pistol would not have been admissible during a trial on the rifle charge alone, Lee has failed to show that there was any prejudicial spillover.

In Pelullo, we established a four-part test to evaluate a spillover claim. We ask

(1) whether the charges were intertwined with each other . . . so as to create substantial confusion on the part of the jury;

. . .

(2) whether the evidence for the different counts was sufficiently distinct to support the verdict on other separate counts;

. . .

(3) whether substantially all the evidence introduced to support the invalid conviction would have been admissible to prove other counts, and whether the elimination of the count on which the defendant was invalidly convicted would have significantly changed the strategy of the trial;

. . .

(4) [whether] the charges, the language that the government used, and the evidence introduced during the trial . . . are of the sort to arouse a jury . . . [and] whether the defendant was branded with some terms with decidedly pejorative connotation . . . so that the prejudicial spillover effect is palpable.

14 F.3d at 898-99 (internal citations omitted).

The first Pelullo factor asks whether the charges were sufficiently intertwined to create confusion on the part of the jury. Id. at 898. Lee argues that the charges did create confusion because a single-count indictment charged him with possessing both the rifle and pistol on the same date, and a single officer described the entire episode. While it is true that the pistol charge and the rifle charge were set forth together in the single-count indictment, and that both allegations arose out of the events of a single day, there was, on this record, no meaningful risk that the jury was confused when asked to consider the two charges.

The proof of the jury's comprehension is that it found Lee guilty of possessing the rifle but not guilty of possessing the pistol. Clearly, it was able to separate the issues and the charges, and it did so, in keeping with the District Court's instructions. The Court said,

In order to find the defendant guilty, you must unanimously determine that the defendant specifically possessed the rifle, or the pistol, or both. For example, it is not sufficient for six jurors to agree that the defendant possessed the rifle and the other six to agree he possessed the pistol. Rather, the verdict slip indicates that all jurors must agree on which weapons, if any, the defendant possessed.

(App. at 601-02.) Questions about the pistol and the rifle were also set forth separately in the special interrogatories attached to the verdict form. In addition, in closing argument, the prosecutor emphasized that the jury needed to consider the pistol charge and the rifle charge separately, saying,

[Y]ou have to find that the defendant possessed the rifle or possessed the pistol or possessed both. That means all of you as a whole. As the Judge told you, six of you can't say, we believe that he possessed the rifle, and the other six say, we believe he possessed the pistol. That's not enough. All twelve final jurors have to determine that the defendant possessed the rifle or possessed the pistol or possessed both.

( Id. at 615.) In short, by argument, instruction, and the verdict form, the jury was told to keep the rifle and pistol charges separate, and their verdict proves that they did.

The second Pelullo factor asks whether the evidence relating to each charge was sufficiently distinct that a verdict as to one could be supported without reference to evidence regarding the other. 14 F.3d at 898. Put differently, we must ask whether there was enough independent evidence concerning Lee's possession of the rifle to support that charge. Lee argues that the government mixed together the pistol and rifle evidence by telling the jury that Kraus had already seen a long slender object concealed on the back seat of Lee's Jeep, and then by asking the jury to infer that what Kraus saw in Lee's lap was a firearm. Lee points to the prosecutor's closing argument, where he asked the jury, "[h]ow about the fact that there was a gun in the back seat? Does that lend any more credence to the fact that what was on [Lee's] lap was a gun and not a squirt gun?" (App. at 615.)

Leaving aside the fact that Lee's logic here is that the rifle evidence was prejudicially spilling over to support the pistol charge, which is the opposite of the point he is trying to make, his argument fails because there was sufficient evidence of his rifle possession that was distinct from any pistol evidence. Shortly after Lee abandoned his Jeep, the same distinctive black coat that Kraus had seen in the Jeep covering the long, slender object on the backseat was located along a fence near the Jeep, and that coat was covering a rifle. That very potent evidence stands independent of the allegation that Lee possessed a pistol, as does the evidence of the bloodhound's tracking his scent from the Jeep along a path where the rifle was found.

The third Pelullo factor asks us to look at whether the absence of the pistol charge would have affected the defense's strategy in a trial on the rifle charge only. 14 F.3d at 898-99. Lee argues that the error affected his trial strategy because the District Court allowed the jury to base a finding of guilt on probabilities or propensity. In other words, because Lee was accused of having two firearms, the jury was permitted to assume that he probably had at least one. Lee argues that this necessarily influenced his trial strategy, because, if only possession of the rifle been charged and had the judgment of acquittal been granted as to the pistol, the jury would not have needed any instruction about unanimity as to either the rifle or the pistol or both.

Instead, the defense would have been a straightforward plea for a weighing of the evidence. . . . Had evidence supporting the improper handgun charge never been presented or been stricken, the jury would not have been authorized to reach a compromise verdict or rely on propensities but would instead have been forced to weigh the evidence and make credibility determinations.

(Appellant's Op. Br. at 37-38.)

This argument has a crucial factual flaw in its assertion that the jury was authorized to reach a compromise verdict. The jury was repeatedly and explicitly told that they were not permitted to do any such thing, as should be clear from the very instruction that Lee cites. Lee does not identify any additional arguments he would have made or any witness he would have called — or not called — if the trial had been solely on the rifle charge, nor does he describe how his questioning of any witness would have been materially different. In fact, Lee's strategy seems to have been exactly what he says it ought to have been, namely, asking the jury to weigh the evidence and make credibility determinations, focusing on uncertainty in Kraus's testimony, and arguing the paucity of physical evidence. It appears that the jury did not "rely on propensities" as Lee suggests they did, but instead was able to "weigh the evidence and make credibility determinations," because they ultimately acquitted him of the pistol charge.

The final Pelullo factor asks whether the pistol charge and its accompanying evidence was pejorative or inflammatory. 14 F.3d at 899. Lee does not offer an argument on this factor, probably because the evidence plainly was neither pejorative nor inflammatory. The evidence was not that Lee threatened Kraus with the pistol, but simply that Kraus saw what he believed to be a pistol on Lee's lap.

Thus, whether or not the District Court erred in denying Lee's motion for judgment of acquittal, all of the Pelullo factors indicate that there was no prejudicial spillover from the pistol charge to the rifle charge. Accordingly, Lee is not entitled to a new trial on the rifle charge.

B. The Bullet-Proof Vest

Lee next argues that the District Court erred when it allowed the government to introduce evidence that he was wearing a bullet-proof vest at the time of the traffic stop, and, further, when it allowed the government to argue, "what goes more with a bullet-proof vest than guns?" (App. at 618.) Lee asserts that this is impermissible propensity evidence under Rule 404(b) and that it is substantially more prejudicial than probative under Rule 403. The District Court ruled that the bullet-proof vest was not excludable under Rule 404(b) because it "is relevant and strong evidence of [Lee's] alleged possession of firearms." (App. at 4.) As a result of the District Court's ruling, both the government's and Lee's briefs focus on whether the bullet-proof vest was admissible under Rule 404(b).

In our view, the admissibility of the bullet-proof vest does not turn on Rule 404(b), because it is not evidence of a separate wrongful act. No one suggested to the District Court or to the jury that Lee's possession of the bullet-proof vest was illegal or otherwise wrongful in and of itself; indeed, there was no suggestion that there was anything inherently "bad" about possessing or wearing a bullet-proof vest. Lee's wearing of the bullet-proof vest is noteworthy only for what it says about the nature of the object on the back seat of his Jeep. Thus, the bullet-proof vest should, in the first instance, be analyzed under Rules 401 and 402, as circumstantial evidence related to a fact directly in issue, namely, Lee's alleged possession of a firearm. Evidence of the bullet-proof vest supports the inference that the long, slender object beneath the coat on the backseat was a firearm, in the same manner that the presence of a razor and small glassine bags found at a crime scene can support the inference that white powder residue found nearby is cocaine. In both the case of drug paraphernalia and drugs and the case of a bullet-proof vest and a firearm, the relationship between the contraband and the tools sometimes used with contraband allows a logical inference to be drawn. In other words, a jury could, after considering Kraus's description of the object on the backseat and Lee's decision to wear a bullet-proof vest, draw an inference that the object was a firearm. The bullet-proof vest is therefore circumstantial evidence upon which the jury could properly move toward a conclusion about gun possession.

Lee next argues that the bullet-proof vest should have been excluded under Rule 403, because " any purported probative value was substantially outweighed by the danger of unfair prejudice." (Appellant's Op. Br. at 44 (original emphasis).) Specifically, Lee argues that the prosecutor's accompanying statement — "what goes more with a bullet-proof vest than guns? Does it corroborate the fact that there was a gun in his lap and that there was a gun in the back seat?" — makes the introduction of the bullet-proof vest even more prejudicial than it would have been on its own. (App. at 618.)

A district court's ruling under Rule 403 may be reversed only if it is "arbitrary or irrational." See United States v. Univ. Rehab. Servs. (PA), Inc., 205 F.3d 657, 665, 669 (3d Cir. 2000) ( en banc) ("[We] cannot reverse a District Court's conclusion under Federal Rule 403 unless such a conclusion is held to be an abuse of discretion, which we have defined as `arbitrary or irrational.'" (citing In re Paoli R.R. Yard PCB Lit., 113 F.3d 444, 453 (3d Cir. 1997))). Here, the Court's ruling was certainly not so infirm. It, in effect, recognized that the prosecutor was only providing the jury with the inferential step that he hoped would be made: that Lee had particular reason to protect himself against gun violence by wearing body armor because he was himself carrying a gun. While prejudicial to Lee, it was not unfairly prejudicial to suggest that bullet-proof vests and guns often accompany one another.

In addition, while we do not think it helpful to view the bullet-proof vest as 404(b) evidence, any concern that the jury might have misinterpreted the relevance of the vest is laid to rest by the District Court's instruction that information related to the vest could only be considered for a limited purpose. The Court told the jury, twice, that it should consider the bullet-proof vest only for "deciding whether the defendant had the state of mind, knowledge, motive or intent necessary to commit the crime charged, or did not commit the acts for which he is on trial by accident or mistake." (App. at 644-45.) Thus, the Court's limiting instruction encouraged the jury to think of the vest only for what it might imply about whether Lee possessed a firearm when Kraus confronted him.

Given the high degree of deference we owe when reviewing a district court's Rule 403 determination, combined with the legitimate probative value of the evidence and the District Court's limiting instruction, we cannot say that the decision to admit the bullet-proof vest evidence was arbitrary or irrational.

C. Lee's Statements Regarding His Prior Possession of Firearms

Lee next argues that the District Court erred in admitting into evidence the statements he made to Kraus during their interview. Specifically, Kraus provided the following testimony at trial regarding those statements:

Lee insisted he does not typically own or carry guns. However, he did state that he has access to a lot of guns and would use them against anyone who threatens him or his family. He stated that he shot at an individual named Pickles, who was well known as Ernest Harris, on multiple occasions. He went on to say that I arrested Pickles, which is true, in the past, with a firearm. And Mr. Lee claimed that on that night, that . . . Pickles was arrested, that Pickles was actually on his way with that gun to kill Mr. Lee. He acknowledged that and said that there's a long time, ongoing violent feud between Mr. Lee's family and Pickles. . . . Lee continued to insist that he did not have any weapons in the car when I stopped him on June 27th, but he did compare that to a time when he stated that he fled from me before in the Hill District. . . . I do remember this. It would have been probably back in 2001 or 2002. . . . He further told me that if I would have caught him that night, I would have caught him with guns in the car, but, again, he continued to insist that he had no guns in the car on June 27th when I stopped him.

(App. at 417-18.) In short, Lee admitted that he had access to guns, that he was willing to use guns, that he had shot at someone with whom he had an ongoing feud, that that person had tried to kill him, and that he had possessed a gun at an earlier time when Kraus tried to stop him. Lee attempted to exclude those statements as impermissible evidence under Rule 404(b), arguing that they do nothing but show a propensity for unlawful gun possession. The District Court denied that motion and held that the statements were "admissible to prove intent, knowledge and/or the absence of mistake. Defendant has denied possession of the firearms in question here." ( Id. at 5.)

On appeal, Lee again argues that his statements constitute impermissible propensity evidence under Rule 404(b). "To the extent that our review of the district court's Rule 404(b) ruling requires us to interpret the rules of evidence our review is plenary, but, if the evidence could have been admissible in some circumstances, we would review the district court's decision to admit evidence . . . for an abuse of discretion." United States v. Daraio, 445 F.3d 253, 259 (3d Cir. 2006) (citation omitted).

The Supreme Court has created a four-step test for the admissibility of evidence covered by Rule 404(b):

(1) the evidence must have a proper purpose under Rule 404(b); (2) it must be relevant under Rule 402; (3) its probative value must outweigh its prejudicial effect under Rule 403; and (4) the court must charge the jury to consider the evidence only for the limited purpose for which it is admitted.

United States v. Sampson, 980 F.2d 883, 886 (3d Cir. 1992) (citing Huddleston v. United States, 485 U.S. 681, 691-92, 108 S.Ct. 1496, 99 L.Ed.2d 771 (1988)). Only the first, third, and fourth steps are contested here, as it is undisputed that, under step two, Lee's statements are relevant.

i. Proper Purpose

If the proffered "evidence only goes to show character, or that the defendant had a propensity to commit the crime, it must be excluded. Where, however, the evidence also tends to prove some fact besides character, admissibility depends upon whether its probative value outweighs its prejudicial effect." Id. at 887 (citing Gov't of V.I. v. Harris, 938 F.2d 401, 419 (3d Cir. 1991)). If the government offers evidence of other wrongful acts, "it must clearly articulate how that evidence fits into a chain of logical inferences, no link of which can be the inference that because the defendant committed . . . [such an act] before, he therefore is more likely to have committed this one." Id. Nevertheless, Rule 404(b) "is inclusive, not exclusive, and emphasizes admissibility." Id. at 886 (citation omitted).

The government presents several arguments as to why Lee's statements are admissible under Rule 404(b). First, it says that Lee's statements are "relevant [to] and admissible regarding the key issue[] of knowledge." (Appellee's Ans. Br. at 45.) Lee's trial, however, was not about whether he knew that he had a rifle in the back seat of his Jeep. There was no question of accident or mistake. Rather, Lee's defense was simply that there was no rifle in his Jeep and that the rifle recovered at the Apartments was not his. Thus, the trial was about weighing Kraus's credibility against Lee's, and, as Lee rightly notes, "[i]t is inconceivable that if the jury believed [Kraus's] testimony it would have found that Lee acted by mistake." (Appellant's Op. Br. at 47.)

The government presses the point, however, saying that knowledge is at issue because Lee did not admit possession of any firearm. It relies on our decision in United States v. Givan, 320 F.3d 452 (3d Cir. 2003), in which the defendant was convicted of conspiring to distribute and possess with intent to distribute heroin. Id. at 455. There, we allowed the government to introduce into evidence the fact that the defendant had a prior felony drug conviction. We accepted the government's argument that,

because it had to prove that Givan knew, prior to its discovery by the troopers, that a quantity of heroin was hidden in the back seat of the rental car and that it had to prove that Givan possessed the heroin with intent to distribute it, knowledge and intent were material and contested issues at trial.

Id. at 460-61. Unlike in Givan, however, where the defendant denied knowing that there was heroin in the backseat of his rental car and that he intended to distribute it, Lee has not put knowledge at issue. Lee is not arguing that he did not know there was a rifle in his back seat. His argument is a straightforward denial that any gun was there.

The government also argues that Lee put his knowledge at issue when his counsel told the jury, "Yes, the police did find the rifle in the woods near where Mr. Lee abandoned his Jeep, but the evidence will show that he did not put it there." (App. at 334.) But the government's argument fails again. The quoted comment does not amount to a statement that Lee did not know the rifle was in his possession or near his vicinity; it was once more an out-and-out denial that he had anything to do with the gun.

The government does far better with motive as a theory of admissibility. According to the government, the statements Lee made to Kraus reveal Lee's motive for possessing firearms because he admitted that he has no qualms about using such weapons against anyone who threatens him or his family, and he stated that he was in a violent feud with Ernest "Pickles" Harris. See App. at 216 ("The defendant's statements regarding his motive for possessing firearms (to use them against anyone who would threaten Mr. Lee or his family, such as . . . `Pickles', with whom he and his family have had a long standing feud) is certainly relevant to his motive to possess a firearm in this matter."). We agree with that assessment of the statements. Not only did Lee claim that, at some point in the past, Harris had planned to shoot him and he had shot at Harris, he also admitted that the feud he and his family had with Harris was ongoing. Moreover, Lee conceded that he "has access to a lot of guns and would use them against anyone who threatens him or his family." ( Id. at 417.) Those statements reveal that Lee had reason to possess a weapon on the day in question.

We note that the final part of Lee's statements to Kraus — in which Lee admitted that he had possessed firearms on a prior occasion in 2000 or 2001 when Kraus stopped him — does not, in isolation, speak to motive in the same way as Lee's statements about possessing guns to protect his family and about his ongoing feud with Harris's family. Based on the record, we cannot tell whether, as a factual matter, the statement about 2000 or 2001 was part and parcel of Lee's first two statements about protecting his family and his violent feud with Harris. Moreover, it is not clear to us whether, as a procedural matter, defense counsel, in argument before the District Court, treated Lee's statements as one single conversation, or whether defense counsel treated the statements as analytically distinct. While defense counsel did parse the statements in a motion in limine submitted to the District Court, in the briefing before us, no distinction was drawn between the various admissions. ( See App. at 180.)

Assuming that this last statement can, as a factual matter, be separated from Lee's first two statements, and assuming further that this last statement was argued separately to the District Court and so can be analyzed separately here, it was error to admit the third statement regarding Lee's 2000 or 2001 gun possession because that statement is not probative of motive (or any other permissible ground listed in 404(b)). Unlike the statements concerning the ongoing feud and his desire and capability to protect himself and his family with guns, his comment that he once had a gun years earlier does not, on its own, prove anything about a present motive to be armed. However, any error in admitting that third statement was harmless in the context of the overall admissions, because it was "highly probable" that the admission of Lee's final statement did not contribute to the conviction, especially considering the fact that the jury had just heard the previous two statements that spoke so directly to Lee's motive. See United States v. Ali, 493 F.3d 387, 392 (3d Cir. 2007) ("[T]he test for harmless error is whether it is highly probable that evidentiary error did not contribute to conviction." (citing Gov't of V.I. v. Toto, 529 F.2d 278, 283-84 (3d Cir. 1976))); 2A FEDERAL PROCEDURE, LAWYER'S EDITION § 3:8444 (1981) ("[F]ederal appellate courts are more willing to find harmless error in the area of evidentiary rulings than they are in other areas of procedure." (citing Julander v. Ford Motor Co., 488 F.2d 839, 843 (10th Cir. 1973))).

In conclusion, the government presented a "chain of logical inferences" between Lee's prior weapons possession and the rifle charge that does not suggest a mere propensity to engage in weapons offenses. Sampson, 980 F.2d at 887. Lee's statements about possessing guns to protect his family and about his ongoing and violent feud with Harris's family are relevant to show his motive for possessing a rifle on the day in question. Thus, the evidence was offered for a proper purpose under Rule 404(b).

ii. Probative Value v. Prejudicial Effect

Given the relevance of Lee's statements, we next determine under Huddleston whether, pursuant to Rule 403, the danger of unfair prejudice substantially outweighs the probative value of the statements. 485 U.S. at 691, 108 S.Ct. 1496. Given the substantial deference owed to district courts in weighing evidence under Rule 403, combined with the highly probative value of the evidence — particularly Lee's statements about his feud with Harris and what that revealed about Lee's motive — the District Court's decision to admit those statements was not "arbitrary or irrational." See Univ. Rehab. Servs., 205 F.3d at 669 ("[We] cannot reverse a District Court's conclusion under Federal Rule 403 unless such a conclusion is . . . `arbitrary or irrational.'" (citation omitted)). Indeed, the statements reveal Lee's motive to possess weapons on the day in question, which is highly probative in a case like this, in which the defendant has denied possession all together.

iii. Limiting Instructions

Lastly, Huddleston requires us to ensure that the District Court charged the jury to consider the evidence only for the limited purpose for which it was admitted. 485 U.S. at 691-92, 108 S.Ct. 1496. The District Court gave a limiting instruction as follows:

Now, you have heard evidence that the defendant . . . made certain statements to Lieutenant Kraus about his past possession and use of firearms when he was arrested on July 12, 2005. This evidence was admitted for a limited purpose only. You may consider this evidence only for the purpose of deciding whether the defendant had the state of mind, knowledge, motive or intent necessary to commit the crime charged in the indictment, or did not commit the acts for which he is on trial by accident or mistake. Do not consider the evidence for any other purpose.

Of course, it is for you to determine whether you believe this evidence, and if you do believe it, whether you accept it for the purpose offered. You may give it as much weight as you feel it deserved, but only for the limited purpose that I described to you.

The defendant is not on trial for committing these other acts. You may not consider the evidence of these other acts as a substitute for proof that the defendant committed the crime charged. You may not consider this evidence as proof that the defendant has a bad character or any propensity to commit crimes. Specifically, you may not use this evidence to conclude that because the defendant may have committed the other acts, he must also have committed the act charged in the indictment.

Remember, the defendant is on trial here only for possessing a firearm on the date in question, not for these other acts. Do not return a guilty verdict unless the government proves the crime charged in the indictment beyond a reasonable doubt.

(App. at 595-97) (quoting THIRD CIRCUIT MODEL JURY INSTRUCTIONS — CRIMINAL § 4.29 (2009).) At the conclusion of the District Court's instructions to the jury, defense counsel asked the Court to repeat the limiting instruction, which it did.

Now, for the first time, Lee challenges the adequacy of that instruction. Because he did not object at trial, any review of the instruction must be for plain error. See United States v. Olano, 507 U.S. 725, 734-36, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993); see also United States v. Pelullo, 399 F.3d 197, 221 (3d Cir. 2005) ("A party generally may not assign error to a jury instruction if he fails to object before the jury retires or to `stat[e] distinctly the matter to which that party objects and the grounds of the objection.'" (quoting Jones v. United States, 527 U.S. 373, 387, 119 S.Ct. 2090, 144 L.Ed.2d 370 (1999))).

Lee has not shown any error in this regard, much less plain error. Though Lee argues that the District Court's instruction provided no guidance because it simply repeated the litany of permissible theories under Rule 404(b), the Court in fact did more than simply list the 404(b) grounds. The instruction properly informed the jury of the limited purpose for considering Lee's admissions about gun possession. To the extent that Lee is now arguing that the jury could not have understood the instruction, we have rejected such sweeping and non-specific assertions before. See Givan, 320 F.3d at 462 ("[I]t is a basic tenet . . . that a jury is presumed to have followed the instructions the court gave it . . . [and i]f we preclude the use of evidence admissible under Rule 404(b) because of a concern that jurors will not be able to follow the court's instructions regarding its use we will inevitably severely limit the scope of evidence permitted by that important rule."). Lee's statements about possessing guns to protect his family and about his feud with Harris therefore meet the guidelines for admissibility articulated in Huddleston. They were admissible for a proper purpose under Rule 404(b) as evidence of Lee's motive for possessing a weapon; they are undisputedly relevant under Rule 402; the District Court's finding under Rule 403 that the danger of unfair prejudicial effect did not substantially outweigh the probative value of the statements was not arbitrary and irrational; and the District Court twice charged the jury to consider the evidence only for the limited purpose for which it is admitted. See Huddleston, 485 U.S. at 691-92, 108 S.Ct. 1496.

D. The Prosecutor's Statements Regarding Digger

Lee next argues that he is entitled to a new trial based on two instances of prosecutorial misconduct. First, he contends that, during the government's closing, the prosecutor improperly referred to evidence regarding the bloodhound, Digger, that had been excluded by the District Court. Second, he asserts that the prosecutor vouched for the credibility of Digger based on his own personal experience with hunting dogs. That misconduct, says Lee, deprived him of due process and a fair trial.

i. Background

In a pre-trial motion, Lee sought to exclude the evidence of Digger's behavior as irrelevant, or, if relevant, inadmissible under Rule 403. Specifically, Lee argued that the evidence would make the jury believe that Digger "actually identified the gun and the jacket when, in fact, that's not what happened." (App. at 226.) Lee also attacked the probative value of the evidence, arguing that the officers searching the area had contaminated the Jeep and the scene so that the dog could not have reliably tracked a scent.

The Court held that the evidence of Digger's tracking was admissible, "as it tends to prove that [Lee], who had occupied the front seat of the Jeep, had traveled along the pathway where the coat and rifle were found and then on to the apartment complex. This is circumstantial evidence that [Lee] possessed and removed the coat and rifle from the Jeep." ( Id. at 2.) The Court added, however, that "the Government has agreed to eliminate any reference in the testimony that Digger paused at the coat and rifle, thus, further reducing any unfair prejudice to [Lee]." ( Id.)

In light of the Court's pre-trial ruling, police officer Harkins, the dog handler, did not mention in his testimony that Digger "paused" at the coat and the rifle. Rather, he said that Digger went from the Jeep, "down a flight of steps, through a very overgrown weeded asphalt parking lot . . . slightly to the left angle of the fence." ( Id. at 458.) He added that Digger "went down the fence line approximately 20, 25 feet" ( id.), and that he came within "10 to 15 inches" of the rifle and the coat. ( Id. at 460.)

Lee argues that, unlike Harkins, the prosecutor disregarded the Court's instructions and argued exactly what the Court had excluded, namely, that Digger paused at the coat and rifle. The prosecutor said the following:

[W]hat Digger told us from Chief Harkins on the stand is that the person who was the driver of that car went straight down the steps, straight across the parking lot, deposited a gun, went through the fence . . . and then ultimately escaped.

. . .

What happened with Digger is that Digger came from the car, went down the steps, across the parking lot and to the gun. Digger did not go to the right where the first person to find this firearm went originally, Digger went in that exact path. Does this support Lieutenant Kraus or does it contradict him?

( Id. at 617; 619.) Lee did not object when those statements were made, but argues on appeal that in making those statements, the prosecutor was suggesting that Digger paused at the rifle, which was forbidden by the Court's earlier ruling. Lee contends that "it is [] improper for a prosecutor, during closing arguments, to bring to the attention to the jury any purported facts that are not in evidence and are prejudicial." (Appellant's Op. Br. at 59 (citation omitted).)

The second instance of alleged misconduct is what Lee calls the prosecutor's impermissible vouching for Digger, by "assuring the jury of Digger's credibility based on [the prosecutor's] . . . own personal experience hunting and tracking using dogs." ( Id.) The specific statements Lee points to are as follows:

I am a hunter. Some of you may be as well. As a hunter, I've had experience with dogs in the past. I've hunted with bird dogs and I've hunted with beagles for the majority of my life. It never ceased to amaze me when we were out with those dogs, their abilities.

When I rabbit hunt with my brothers and my father, we would sometimes see a rabbit, we would jump a rabbit and it would be running out front. Our dog, being much smaller than us, he couldn't necessarily see the rabbit, so we had a signal that we would tell the dog where we saw and what we saw. We would say, here's the bunny. That meant to the dog, we saw the rabbit, here's where we think it was. And the dog would come there and start to circle and from just going to that location, smelling in one direction and then smelling in the other, that dog could tell which one of those two tracks was fresher and go in the direction that the rabbit went to rather than where the rabbit came from. That never ceased to amaze me.

Or, when you hunted with bird dogs, that that bird dog would stop a foot and a half from this particular bird, a pheasant —

(App. at 615-16.) At that point, Lee's counsel objected, noting the "personal nature of the testimony which doesn't have anything to do with the evidence." ( Id.) The District Court sustained defense counsel's objection, stating that "we should move from that." ( Id.) The prosecutor complied and did not return to his reminiscing.

ii. Standard of Review: Prosecutorial Misconduct

We review for abuse of discretion a district court's ruling on a contemporaneous objection. United States v. Brennan, 326 F.3d 176, 182 (3d Cir. 2003). However, any non-contemporaneous objections are reviewed for plain error. Id. While Lee objected to one portion of the prosecutor's closing argument — the portion that Lee now claims was vouching — he did not object to the part of the closing involving Digger's behavior near the rifle. It is only here on appeal that he asserts that the prosecutor committed misconduct by suggesting that Digger paused at the coat and rifle. Thus, we review the ruling on alleged vouching for abuse of discretion, and we review the prosecutor's description of Digger's behavior near the rifle for plain error.

A prosecutor's comments can create reversible error if they "so infected the trial with unfairness as to make the resulting conviction a denial of due process." Donnelly v. DeChristoforo, 416 U.S. 637, 643, 94 S.Ct. 1868, 40 L.Ed.2d 431 (1974). "[A] criminal conviction is not to be lightly overturned on the basis of a prosecutor's comments standing alone, for the statements or conduct must be viewed in context; only by so doing can it be determined whether the prosecutor's conduct affected the fairness of the trial." United States v. Young, 470 U.S. 1, 11, 105 S.Ct. 1038, 84 L.Ed.2d 1 (1985). Moreover, we "must examine the prosecutor's offensive actions in context and in light of the entire trial, assessing the severity of the conduct, the effect of the curative instructions, and the quantum of evidence against the defendant." Moore v. Morton, 255 F.3d 95, 107 (3d Cir. 2001). "A finding of prosecutorial misconduct requires reversal unless the error is harmless." Brennan, 326 F.3d at 182. "If the error is constitutional, we will affirm [only] if we determine that the error is harmless beyond a reasonable doubt." United States v. Helbling, 209 F.3d 226, 241 (3d Cir. 2000). "If the error is non-constitutional, we will affirm when it is highly probable that the error did not contribute to the judgment." Id. (quotation omitted).

iii. The Prosecutor's Alleged Reliance on Excluded Evidence

Though silent on the issue before, Lee now contends that the prosecutor committed misconduct by alluding to excluded evidence in suggesting that Digger "paused" at the coat and rifle. (App. at 2.) Lee's previous silence is understandable, since the record does not actually support his argument. At no time did the prosecutor state that Digger paused or hesitated at the coat and the rifle. While the prosecutor did state that "Digger came from the car, went down the stairs, across the parking lot and to the gun" ( Id. at 619), and while that comment arguably comes close to what was prohibited by the District Court, there was no assertion that the dog paused or alerted at the gun. Instead, a fair interpretation of the prosecutor's argument is that Digger led the police away from the car, down a path, and to the area where the coat and rifle were located, before heading to the Apartments. Given Harkins's testimony that Digger traced a path from Lee's car to within inches of where the police discovered the coat and rifle, the District Court's allowing the prosecutor's argument was not plain error. We have repeatedly held that a "prosecutor is entitled to considerable latitude in summation to argue the evidence and any reasonable inferences that can be drawn from that evidence." United States v. Werme, 939 F.2d 108, 117 (3d Cir. 1991) (citation omitted). That latitude encompasses the argument that the path that Digger tracked was evidence that Lee had dropped the coat and rifle by the fence.

iv. The "Vouching" Argument

A prosecutor may not vouch for the credibility of a witness based on the prosecutor's personal knowledge, experience, or opinions. See Young, 470 U.S. at 18-19, 105 S.Ct. 1038. Vouching occurs when two criteria are met: "(1) the prosecutor must assure the jury that testimony of a Government witness is credible; and (2) this assurance is based on either the prosecutor's personal knowledge, or other information not contained in the record." United States v. Walker, 155 F.3d 180, 187 (3d Cir. 1998). While Lee says that the prosecutor vouched for the bloodhound evidence, the government argues that there was no vouching because the prosecutor "merely told an anecdote about his own experience with Beagles and bird dogs." (Appellee's Ans. Br. at 64.) The government then argues that it is "common knowledge that dogs have an ability much greater than humans to detect scent." ( Id. at 65 (quotation omitted).)

Whether something is "common knowledge" to a group of people largely depends, of course, on the composition of the group. The amazing abilities of hunting dogs are not the common ken of all humanity. Perhaps the heightened ability of dogs to detect scent is well-known, but the prosecutor did not confine himself to that. Rather, he spoke from his own personal experience with dogs, dating back to his childhood, and reflected on the remarkable things he had witnessed. As a result, the jury may have been influenced by the prosecutor's experiences, thinking that the prosecutor's views bolstered the credibility of Kraus's and Harkins's testimony about Digger. This is what the rule against vouching prohibits.

However, even though the prosecutor did cross the line into improper vouching, a new trial is not warranted because it is highly probable that the error did not contribute to Lee's conviction, for several reasons. Helbling, 209 F.3d at 241. First and most significantly, the prosecutor did not continue the vouching once an objection was raised and the District Court directed the prosecutor to move on. See United States v. Galloway, 316 F.3d 624, 633 (6th Cir. 2003) (holding that, while prosecutor's statement concerning his personal opinion were improper, the statement did not warrant a reversal because the defendant objected at trial and the court sustained the objection and directed the prosecutor to move on). Second, the acuteness of Digger's sense of smell was of record through Harkins's testimony. Third, the testimony about Digger's behavior required no vouching. The dog went within inches of the rifle on its way to the Apartments. That concrete and specific evidence, not general praise for the nose on man's best friend, is what in all likelihood left an impression on the jury, if anything about Digger did. Fourth, the Court specifically instructed the jury that "what the lawyers said is not evidence and it's not binding on you." (App. at 589.)

Thus, despite the wholly unnecessary vouching for the testimony about Digger and the gratuitous comments about a dog's ability to track a scent, a new trial is not warranted because it is highly probable that the misconduct did not contribute to the judgment.

Lee challenges his sentence, arguing that the District Court erred in classifying his misdemeanor conviction for reckless endangerment as a "crime of violence," thereby increasing his offense level under the career offender enhancement found in § 2K2.1(a)(2) and (a)(4) of the Sentencing Guideline s. The government had argued to the District Court that Lee's conviction was a crime of violence under the Guidelines but, on appeal, concedes that "reckless conduct, standing alone, is not the type of purposeful conduct that can constitute a crime of violence . . . [and thus, Lee's] sentence should be vacated and the case remanded for the purposes of re-sentencing." (Appellee's Ans. Br. at 68 (citation omitted).)

Lee and the government are correct in their agreement about the law. Following Lee's sentencing hearing, the Supreme Court decided Begay v. United States, 553 U.S. 137, 128 S.Ct. 1581, 170 L.Ed.2d 490 (2008), in which it effectively held that, to qualify as a crime of violence, the crime at issue must present "a serious potential risk of physical injury" and be one that "typically involves purposeful, violent, and aggressive conduct." Id. at 144-45, 128 S.Ct. 1581. The Court expressly distinguished crimes involving negligence or recklessness from those involving violence or aggression. Id. at 146, 128 S.Ct. 1581; see also United States v. Johnson, 587 F.3d 203, 208 (3d Cir. 2009). Thus, following Begay, a conviction for mere recklessness cannot constitute a crime of violence.

Lee's earlier-noted conviction for concededly reckless conduct, standing alone, does not qualify as a crime of violence. Accordingly, as the parties agree, Lee's sentence must be vacated and the case remanded for re-sentencing.

F. The Constitutionality of the Felon-In-Possession Statute

Finally, Lee argues that the felon-in-possession statute is unconstitutional. He recognizes, however, that we are bound by our decision in United States v. Singletary, 268 F.3d 196, 198-205 (3d Cir. 2001), in which we confirmed the constitutionality of the felon-in-possession statute, and he acknowledges that he presents this issue only "to preserve a challenge to the constitutionality of [the felon-in-possession statute] for Supreme Court review." (Appellant's Op. Br. at 80.) We therefore reject that argument without further discussion.

III. Conclusion

For the reasons discussed above, we will affirm Lee's conviction but will vacate his sentence and remand for re-sentencing.