SENTELLE, Circuit Judge:

Opio Moore appeals from convictions for (1) unlawful possession with intent to distribute cocaine in violation of 21 U.S.C. Section(s) 841(a)(1) and (b)(1)(C); (2) using and carrying a firearm during and in relation to a drug trafficking offense in violation of 18 U.S.C. Section(s) 924(c); (3) unlawful possession of a firearm by a convicted felon in violation of 18 U.S.C. Section(s) 922(g)(1); (4) possession of an unregistered firearm in violation of D.C. Code Ann. Section(s) 6-2311(a); and (5) possession of unregistered ammunition in violation of D.C. Code Ann. Section(s) 6-2361(3). He argues and the government concedes that the Supreme Court's intervening opinion in Bailey v. United States, ___ U.S. ___, 116 S.Ct. 501 (1995), requires that the conviction under 18 U.S.C. Section(s) 924(c) be vacated. We agree. Moore further argues that the district court erred in failing to sever the felon-in-possession charge from the other charges and in failing to sever his trial from that of his co-defendant; that the court abused its discretion in permitting certain expert testimony; that improper statements by the prosecutor denied him a fair trial; that the evidence was insufficient to sustain his convictions; and that the district court erred in denying, without a hearing, his motion pursuant to 28 U.S.C. Section(s) 2255 alleging ineffective assistance of counsel. Because none of these arguments establishes prejudicial error, we affirm the remaining convictions.

I. BACKGROUND

On December 30, 1992, at approximately 1:20 a.m., Officer Christopher Sanders of the Metropolitan Police Department ("MPD") observed a Buick containing three individuals moving eastbound on H Street, N.W., at a high rate of speed. The car passed through several red lights without stopping. Officer Sanders pursued the car and signaled for it to stop. When the car came to a stop, Sanders, who was alone on patrol, approached the car and ordered the driver, Opio Moore, to exit the vehicle. Moore exited the car and raised his hands in the air. Sanders noticed a dark object under Moore's armpit. Suspecting that this object was a gun, the officer conducted a protective frisk for weapons. The frisk revealed that Moore was wearing an empty shoulder holster and a bullet-proof vest. At this time Officer Sanders noticed several bullet holes in the front of the car. Additional police officers soon arrived on the scene. The officers removed Daniel Armstead, a rear-seat passenger, from the car and frisked him. He too was wearing a bullet-proof vest. A frisk of the third occupant of the car disclosed nothing.

Moore produced a driver's license and registration. The registration revealed that Moore was the owner of the car. After Moore agreed to a search of the car, officers discovered a loaded 9-millimeter semiautomatic pistol, a loaded .45-caliber semiautomatic pistol, a loaded .38-caliber revolver, a large quantity of cocaine, and a roll of duct tape in the engine compartment. Except for the roll of duct tape, these items were positioned around the car's battery. The duct tape was by the windshield on the driver's side. The 9-millimeter and the .45-caliber handguns each fit the shoulder holster worn by Moore.

The government prosecuted Moore and Armstead in a joint trial. On April 20, 1993, the jury returned its verdict, finding Moore guilty on all counts. It was unable to reach a verdict on the charges against Armstead. The judge declared a mistrial as to Armstead. Moore appeals from his conviction raising numerous points of error which we consider in turn.

II. ANALYSIS [7] A. Conviction Under 18 U.S.C. Section(s) 924(c)

Moore was convicted of "us[ing] or carr[ying] a firearm" during a "drug trafficking crime" in violation of 18 U.S.C. Section(s) 924(c). He argues on appeal that this conviction must be reversed because the district court's instructions to the jury on the elements of a section 924(c) offense were contrary to the Supreme Court's subsequent interpretation of that statute in Bailey v. United States, 116 S.Ct. 501 (1995). The government concedes that Moore's conviction under section 924(c) should be reversed in light of Bailey, but requests that the case be remanded to the district court for resentencing at which time Moore will be subject to a two-level increase under the Sentencing Guidelines for possession of a weapon. We agree that Moore's conviction under section 924(c) must be reversed, and we remand the case for resentencing. See United States v. Fennell, 77 F.3d 510 (D.C. Cir. 1996) (per curiam). B. Sufficiency of the Evidence

Moore further argues that his other convictions must be overturned for lack of sufficient evidence of possession (of either firearms or drugs), a requisite element of each of the charged crimes. In considering a sufficiency of the evidence claim, we review "the evidence de novo, in [the] light most favorable to the Government in order to determine whether a 'rational trier of fact could have found the essential elements of the crime beyond a reasonable doubt.'" United States v. Moore, 97 F.3d 561, 563-64 (D.C. Cir. 1996) (citations omitted). We draw no distinction between direct and circumstantial evidence. United States v. Davis, 562 F.2d 681, 684 (D.C. Cir. 1977) (per curiam).

Criminal possession of firearms or drugs may be either actual or constructive. United States v. Raper, 676 F.2d 841, 847 (D.C. Cir. 1982). Constructive possession exists when "the defendant knew of, and was in a position to exercise dominion and control over, the contraband." United States v. Byfield, 928 F.2d 1163, 1166 (D.C. Cir. 1991). While mere proximity to drugs or guns is not sufficient to establish possession, see United States v. Lucas, 67 F.3d 956, 960 (D.C. Cir. 1995), "evidence of some other factor — including connection with a gun, proof of motive, a gesture implying control, evasive conduct, or a statement indicating involvement in an enterprise — coupled with proximity may" suffice, United States v. Gibbs, 904 F.2d 52, 56 (D.C. Cir. 1990). The evidence in this case was more than sufficient to support the jury's conclusion that Moore was in possession of the drugs and firearms found under the hood of his car. Moore was driving an automobile registered in his name. He was wearing a bullet-proof vest and an empty shoulder holster. There were three handguns concealed in the car, two of which fit into the shoulder holster Moore was wearing. These handguns were found under the hood lying near a bag filled with cocaine. In addition, the officers found a roll of duct tape under the hood. At trial, a government drug expert testified that these facts give rise to the inference that "some individuals are involved in a drug operation." Of course, the mere fact that three handguns were found in Moore's car is insufficient to establish possession. However, the presence of the guns in a car owned and operated by Moore coupled with the fact that two of the guns fit the shoulder holster worn by Moore suggests that he knew of and exercised control over the guns. The fact that Moore was driving a bullet-riddled car and wearing a bullet-proof vest strengthens the inference. Moore's connection to the guns suggests possession of the drugs found next to the guns and in Moore's car. See United States v. Dunn, 846 F.2d 761, 764 (D.C. Cir. 1988) (holding that a defendant's connection to a "tool of the narcotic trade" — in that case a gun — suggests that the defendant exercised control over drugs found in the same locale). In sum, the evidence of possession, though circumstantial, was strong.

Moore complains that his conviction was obtained without "smoking gun" evidence. This claim is frivolous. We have long held that the government need not produce a "smoking gun" to obtain a conviction. See United States v. Poston, 902 F.2d 90, 94 n. 4 (D.C. Cir. 1990) (holding that "[t]here is no requirement of any direct evidence against the defendant"); United States v. Torres, 901 F.2d 205, 224 (2nd Cir.) (holding that a "smoking gun" is unnecessary to sustain a conviction against a sufficiency of the evidence claim), cert. denied, 498 U.S. 906 (1990); United States v. Kaplan, 832 F.2d 676, 679 (1st Cir. 1987) ("For us to sustain the jury's determinations we need not find a 'smoking gun.'"), cert. denied, 485 U.S. 907 (1988). Indeed, the doctrine of constructive possession necessarily belies Moore's implicit claim that he could be convicted only if caught "red-handed." We therefore reject Moore's claim that the evidence was insufficient to convict.

C. Severance [12] 1. Felon-in-possession Charge

Moore next argues that the district court erred in failing to sever his charge of possession of a firearm by a convicted felon from the other counts of his indictment. Rule 14 of the Federal Rules of Criminal Procedure provides that a district court "may" order that counts be tried separately "[i]f it appears that a defendant . . . is prejudiced by joinder of offenses . . . for trial together. . . ." Fed.R.Crim.P. 14. "We have long recognized that where a felon-in-possession charge is joined with other counts, the defendant may be unduly prejudiced with respect to the other counts by the introduction of prior crimes evidence that would otherwise be inadmissible under the Federal Rules of Evidence." United States v. Myles, 96 F.3d 491, 495 (D.C. Cir. 1996). Nevertheless, we have rejected a per se rule requiring severance of a felon-in-possession charge from other counts. United States v. Daniels, 770 F.2d 1111, 1118 (D.C. Cir. 1985). Instead, we have opted for a case-by-case approach, holding that, where a defendant moves before the trial court for severance of such charge, "the trial judge must 'proceed with caution' to avoid undue prejudice." See United States v. Dockery, 955 F.2d 50, 53 (D.C. Cir. 1992). There are several safeguards short of severance that a district court may employ to avoid "undue prejudice," including a stipulation as to the existence of the prior felony conviction, a bench trial on the 922(g)(1) charge, or a cautionary jury instruction. Id. at 54-55.

A district court's ruling on a properly filed motion to sever charges is subject to appellate review, albeit only for abuse of discretion. United States v. Dockery, 955 F.2d at 54. In this case, however, Moore failed to file a severance motion with the district court or request that other measures be taken to minimize the prejudice from the joinder of the 922(g)(1) charge. Nevertheless, Moore argues that the district court erred in failing to employ one of the Dockery safeguards sua sponte. We disagree. It is not the duty of the district court to raise the issue of severance in the first instance. A district court has no sua sponte obligation to order the severance of a felon-in-possession charge or take other prophylactic measures. See United States v. Myles, 96 F.3d at 496. Where, as here, a defendant fails to move for severance of a charge at the trial level, we will review only for "plain error." United States v. Clarke, 24 F.3d 257, 262 (D.C. Cir. 1994). The plain error standard of review requires us to ask: "(1) whether there is unwaived legal error, (2) whether the error was 'plain' or 'obvious' under current law, and (3) whether the error was prejudicial." United States v. Fennell, 53 F.3d 1296, 1301 (D.C. Cir. 1995) (internal quotations omitted).

Relying on our opinion in Dockery, Moore argues that the failure to sever the felon-in-possession charge in this case unfairly prejudiced his right to a fair trial because his otherwise inadmissible prior conviction "was continually presented to the jury throughout the trial." The government responds that, under Dockery, any unfair prejudice to Moore was eliminated by the fact that the prosecutor stipulated to the existence of Moore's prior felony conviction and "did not mention the specific nature of the underlying felony conviction to the jury" at any time during trial. But we did not hold in Dockery that a prosecutor may refer to the existence of a defendant's prior felony conviction with impunity so long as he does not mention its specific nature. Indeed, the specific nature of the underlying felony was not put before the jury in Dockery. See 955 F.2d at 56 n. 5. We nonetheless held that the government's "repeated" references to the defendant's prior conviction during trial constituted "undue prejudice." Id. at 50-51. Dockery stands for the proposition that a stipulation may reduce the prejudice flowing from the joinder of a felon-in-possession charge, id. at 54, but a defendant may nonetheless be unduly prejudiced by repeated and gratuitous references to the existence of the previous conviction, see id. at 56. The question then is whether the references to the previous conviction were legitimate or gratuitous. See id.; cf. United States v. Myles, 96 F.3d at 497 (asking whether references to the specific "nature of the predicate offense" were legitimate or "gratuitous"). In this case we hold that all the government's references were legitimate.

Moore notes that the existence of his previous conviction was repeated to the jury five times. Our opinion in United States v. Myles makes clear that three of these references were entirely proper. The first reference to Moore's previous conviction occurred when, prior to trial, the district court read the indictment containing the felon-in-possession charge to the jury. We held in Myles that it is appropriate for a judge to read the indictment to the jury even if the jury is thereby informed of the existence of a defendant's prior felony conviction. Id. at 496. The second reference to Moore's previous conviction occurred during the government's opening statement. We held in Myles that this too is appropriate. Id. The previous conviction was again referenced by the prosecutor when he announced the stipulation that "Moore . . . had a previous felony conviction, the maximum penalty which exceeded one year." This too is proper, as it is analogous to the introduction into evidence of the certified conviction in Myles. Id. The other purported references to Moore's previous conviction were, in fact, nothing more than jury instructions that Moore was charged with possession of a firearm as a convicted felon. Instructing the jury that one of the counts against the defendant is a felon-in-possession charge can hardly be considered a gratuitous reference to the previous conviction. In sum, none of the references by the court or the prosecutor to Moore's previous conviction were unnecessary or gratuitous. As a result, we cannot say that the legitimate references to Moore's previous conviction created "undue prejudice." Moore is not entitled to a reversal of his convictions absent such prejudice.

2. Co-defendant

As with joined charges, a court "may" sever joined defendants "[i]f it appears that a defendant . . . is prejudiced by joinder of . . . defendants . . . for trial together." Fed.R.Crim.P. 14. Normally, we review a district court's denial of a motion to sever defendants for abuse of discretion. United States v. Tarantino, 846 F.2d 1384, 1398 (D.C. Cir.) (per curiam), cert. denied, 488 U.S. 840 (1988).

Moore asserts that severance was required in this case because it presented the "classic case of irreconcilability" — "one co-defendant pointing the accusing finger directly at the other." The parties dispute whether Moore preserved this issue for appeal. Only Armstead filed a pre-trial motion for severance. Moore, however, argues that this motion should be attributed to him based on an agreement between the parties and the court that all defense "objections" be deemed jointly made. But the agreement applied only to "objections," not motions, for the stated purpose of eliminating the need "for both [defendants] to stand up and say we join." Moreover, even were we to attribute Armstead's severance motion to Moore, the motion did not raise "irreconcilable defenses" as a basis for severance. A party is precluded from raising on appeal a basis for severance not made at trial in the severance motion. Cf. United States v. Johnson, 802 F.2d 1459, 1465 (D.C. Cir. 1986) (holding that a defendant waives "any legal objections not actually articulated at trial"). The only basis for severance asserted in Armstead's motion was that a joint trial prevented him from calling his co-defendant, Moore, to testify. Moore cannot now object to the district court's failure to sever on the ground of "irreconcilable defenses."

Alternatively, Moore contends that his mid-trial request for severance preserved the "irreconcilable defenses" issue for appeal. We disagree. Rule 12 of the Federal Rules of Criminal Procedure provides that motions to sever not made "prior to trial" are considered waived. Fed R. Crim. P. 12(b)(5), (f). A district court "for cause shown may . . . grant relief from the waiver." Fed.R.Crim.P. 12(f). Assuming arguendo that unexpected developments at trial constitute "cause" for granting relief from a waiver, Moore even then never asserted to the district court the ground he now raises. See United States v. Johnson, 802 F.2d at 1465 (holding that a defendant waives "any legal objections not actually articulated at trial"). The only ground for severance he asserted was Armstead's attempt to introduce Moore's testimony from the suppression hearing. The ground of irreconcilable defenses was not preserved for appeal. We therefore review the district court's failure to sever on the ground of "irreconcilable defenses" only for "plain error." United States v. Clarke, 24 F.3d at 262.

Moore maintains that severance was required in this case because he and Armstead planned to point the accusing finger at one another at trial. The Supreme Court rejected a similar argument in Zafiro v. United States, 506 U.S. 534, 540 (1993), where four defendants asserted that severance was necessary because they each "claim[ed] they [were] innocent and each accuse[d] the other of the crime." The Supreme Court held that severance is necessary "under Rule 14 only if there is a serious risk that a joint trial would compromise a specific trial right of one of the defendants, or prevent the jury from making a reliable judgment about guilt or innocence." Id. at 539.

Under Zafiro, the mere fact that Moore and his co-defendant intended to and did point the accusing finger at one another during the joint trial does not require that their trials be severed. Therefore, the district court did not err, much less plainly err, in failing to sever the trials.

D. Expert Testimony

During the government's case-in-chief, Detective Tyrone Thomas of the MPD testified as an expert in the use and trafficking of narcotics. He testified, over Moore's objection, that duct tape such as that found under the hood of Moore's car is often used "by people in the drug world to bind hands, legs, and mouths of people who are either being robbed in the drug world or who need to be maintained." Moore argues that the district court erred in permitting this testimony. But Rule 702 of the Federal Rules of Evidence provides that expert testimony is permissible if it "will assist the trier of fact to understand the evidence or to determine a fact in issue." Fed.R.Evid. 702. The fact that duct tape is a tool of the narcotics trade is likely beyond the knowledge of the average juror but is relevant to the issue of Moore's intent to distribute the drugs found in his possession. Therefore, the expert's testimony satisfied the requirements of Rule 702.

Moore argues that even if the expert testimony was "helpful" to the jury, it should have been excluded under Rule 403 because its prejudice "substantially outweighed" its probative value in that the evidence indicated to the jury that Moore was a violent individual who binds people with duct tape. While the expert testimony may well have prejudiced Moore, the evidence had significant probative value. "[T]he trial judge has broad discretion" on Rule 403 balancing questions. United States v. Mitchell, 996 F.2d 419, 423 (D.C. Cir. 1993). We cannot say that the court abused its discretion by admitting the testimony.

E. Prosecutorial Misconduct

Moore alleges that he was unfairly prejudiced by several improper prosecutorial remarks. Three of these remarks warrant discussion.

1. Comment on Defendant's Silence

Moore raises a colorable claim of improper prosecutorial comment on his post-arrest silence. During the direct examination of Officer Sanders, the prosecutor asked the officer if the defendants said anything when the guns and drugs were found under the hood of the car. Defense counsel did not object to this question, and the officer answered "No." Then, during closing argument, the prosecutor argued to the jury that if Moore "didn't know the stuff was underneath the hood, [he] would at least look surprised. [He] would at least [have] said, 'Well, I didn't know it was there.'" Defense counsel objected to this line of argument. The judge called the attorneys to the bench. Armstead's counsel stated that she believed the prosecutor was improperly "comment[ing] on post-arrest silence." The prosecutor stated that he had not done so. The court agreed with defense counsel, but nevertheless overruled the objection.

Our separately concurring colleague denies that appellant asserted his in-custody status. However, both in the trial court at the bench conference and twice in the brief on appeal, the defense counsel referred to the prosecution's improper use of "post-arrest" silence. To hold this insufficient to bring the subject before the court seems to us to split the hair far too finely. In any event, the trial judge obviously understood that the issue of post-arrest silence was before him as counsel for the two sides briefly argued the subject. Indeed, counsel for the co-defendant expressly stated, "Your Honor, it is completely improper for him to comment on post-arrest silence." Our colleague supposes that our opinion "stands for the proposition that a party need not assume the burden to prove facts relevant to a legal argument [on appeal]." The trial judge at the point when the question was raised ruled that the prosecuting attorney had done precisely what the defense attorney accused him of. The judge's statement "I think you did that," is not, as our colleague suggests, ambiguous. The referent of the pronoun "that" is clearly the last preceding "accusation" denied by the prosecution — that is, "commenting on post-arrest silence."

Plainly, therefore, the trial judge accepted the defense's proposition that the prosecutor had commented on post-arrest pre-trial silence. It is not readily apparent what more the defense attorney needed to, or indeed could have done to preserve the question on the present record. The Fifth Amendment to the Constitution provides that "[n]o person . . . shall be compelled in any criminal case to be a witness against himself. . . ." U.S. Const. amend. V. To give full effect to this protection, the Supreme Court has held that "the fifth amendment . . . forbids . . . comment by the prosecution on the accused's silence. . . ." Griffin v. California, 380 U.S. 609, 615 (1965). Griffin, and the cases upon which it relied, concerned the prosecution's comment on defendant's failure to testify at trial. Arguably, Griffin did not determine the propriety of prosecutorial comment on a defendant's pre-trial silence, and our colleague rightly notes that the self-incrimination clause of the Fifth Amendment does not on its face refer to rights accruing before trial. However, the Supreme Court has elsewhere made clear that "the prosecution may not . . . use at trial the fact that [the defendant] stood mute or claimed his privilege in the face of accusation" when he was "under police custodial interrogation." Miranda v. Arizona, 384 U.S. 436, 468 n. 37 (1966). Thus the Supreme Court, in Miranda among many other decisions, has made it clear that the protection extends backward at least to the time of custodial interrogation.

Although in the present case, interrogation per se had not begun, neither Miranda nor any other case suggests that a defendant's protected right to remain silent attaches only upon the commencement of questioning as opposed to custody. While a defendant who chooses to volunteer an unsolicited admission or statement to police before questioning may be held to have waived the protection of that right, the defendant who stands silent must be treated as having asserted it. Prosecutorial comment upon that assertion would unduly burden the Fifth Amendment privilege. Additionally, a prosecutor's comment on a defendant's post-custodial silence unduly burdens that defendant's Fifth Amendment right to remain silent at trial, as it calls a jury's further attention to the fact that he has not arisen to remove whatever taint the pretrial but post-custodial silence may have spread. We therefore think it evident that custody and not interrogation is the triggering mechanism for the right of pretrial silence under Miranda. Any other holding would create an incentive for arresting officers to delay interrogation in order to create an intervening "silence" that could then be used against the defendant.

Therefore, nothing else appearing, the prosecution's use of Moore's pre-trial silence in its summation violated his Fifth Amendment rights. However, much else appears. Although it is plain from Griffin and Miranda that the prosecution may not use a defendant's silence in its case-in-chief, the Supreme Court has long "recognized that the Fifth Amendment is not violated when a defendant who testifies in his own defense is impeached with his prior silence." Jenkins v. Anderson, 447 U.S. 231, 235 (1980) (relying on Raffel v. United States, 271 U.S. 494 (1926)). The government attempts to justify its use of Moore's silence by a misinterpretation of Doyle v. Ohio, 426 U.S. 610 (1976), an earlier decision concerning the same issue authoritatively decided in Jenkins, which disallowed the use of defense silence even for impeachment under the circumstances of that case.

In Doyle, the prosecution had impeached the defendant at trial by cross-examining him about his failure to have told his exculpatory story "after receiving Miranda warnings at the time of his arrest." Id. at 611. The majority held that the silence could not be used even for impeachment purposes because, "while . . . the Miranda warnings contain no express assurance that silence will carry no penalty, such assurance is implicit to any person who receives the warnings." Id. at 618. It would, the Court held, therefore be "fundamentally unfair and a deprivation of due process" to allow the use of the warned arrestee's silence to be used even for impeaching an explanation first offered at trial.

In the present case, the government, on appeal and apparently at trial, relies on a fundamental misunderstanding of the Doyle decision. The prosecution argues that that decision stands for the proposition that "the use at trial of a defendant's 'silence at the time of arrest and after receiving Miranda warnings, violate[s] the due process clause of the Fourteenth Amendment.'" Thus, the prosecution contends, its use of Moore's silence did not violate his rights against self-incrimination as he had not yet received his Miranda warning at the time that he stood silent. But the government's construction of Doyle relies on quoted language from that decision taken not just out of the context of the decision as a whole but even out of context of the sentence in which the language appears. The entire sentence from which the prosecution has surgically excised a favorable portion reads "We hold that the use for impeachment purposes of petitioners' silence, at the time of arrest and after receiving Miranda warnings, violated the due process clause of the Fourteenth Amendment." Doyle, 426 U.S. at 619 (emphasis added). It is plain that the significance of the Miranda warnings in establishing the ability of the prosecution to use the defendant's silence is limited to impeachment. Indeed, the Doyle Court noted that even "the State does not suggest petitioners' silence could be used as evidence of guilt," but only contended that it was necessary for cross-examination and impeachment of "petitioners' exculpatory story." Id. at 617.

Neither Doyle nor any other case stands for the proposition advanced by the prosecution that the defendant's silence can be used against him so long as he has not received his Miranda warnings. Logically, none could.

It simply cannot be the case that a citizen's protection against self-incrimination only attaches when officers recite a certain litany of his rights. The Supreme Court's purpose in requiring the arresting authorities to advise a defendant of his right to silence and counsel in Miranda was to assure that those rights were properly safeguarded before any statements he made could be used against him, not his silence. See Miranda, 384 U.S. at 467-79. To hold, as the Government contends the Supreme Court did in Doyle, that the failure to give those same warnings permits the state to use a defendant's silence against him turns a whole realm of constitutional protection on its head. Our colleague accepts the Government's position on Doyle because of a fundamental misunderstanding not only of the nature of that decision but of the general law applicable to the use of a defendant's silence against him. Reflective of this misunderstanding is his challenge that "the majority does not and cannot explain why the logic of Doyle and Weir is cabined to impeachment." Concurring Op. at 8. In fact, that "logic" deals with nothing else. Doyle is an exception to an exception to the general rule. The general rule regarding a defendant's silence is that it cannot be used. The defendant's testifying creates an exception allowing the testimony to be used for the purpose of impeachment. The presence of the Miranda warning before the silence causes an estoppel that restores to the defendant the protection against the use of the silence. Both the majority and the dissent in Doyle make that plain.

The Doyle majority noted that even "the State does not suggest petitioners' silence could be used as evidence of guilt[.] [I]t contends that the need to present to the jury all information relevant to the truth of petitioners' exculpatory story fully justifies the cross-examination that is at issue." 426 U.S. at 617. The dissent, which did not accept the estoppel theory and would have upheld the use of the silence for impeachment, nonetheless recognized that "as long ago as Raffel v. United States, 271 U.S. 494, this Court recognized the distinction between the prosecution's affirmative use of the defendant's prior silence and the use of prior silence for impeachment purposes." 426 U.S. at 628 (Stevens, J., dissenting). In short, all the justices recognized the general rule and the impeachment exception. A minority would not have recognized the exception to the exception. Our colleague's assertion that in Fletcher v. Weir, 455 U.S. 603 (1982) (per curiam), "the Supreme Court agreed with precisely the position espoused by the government here" is simply incorrect. Fletcher did not in any sense involve the use of a defendant's silence as bearing upon his guilt. Fletcher, like Doyle, was an impeachment case. As our colleague correctly notes, the Supreme Court held that Doyle did not apply, because Miranda warnings had not been offered. We have no doubt that this is controlling law in the case of the use of silence for impeachment. The present case is not an impeachment case, and neither Doyle nor Fletcher has anything to do with it. Therefore the prosecution's use of appellant's silence in its jury argument violated his rights under the Fifth Amendment as applied in the Griffin decision, unless some other factor permits the use of such silence.

The government contends that we should find such a factor permitting the use of the silence in the fact that the silence to which the prosecutor referred occurred before Moore was placed under arrest. Regardless of whether or not we would agree with the government that the Griffin/Doyle exclusion does not apply to pre-arrest silence, the record does not support that argument in this case. Here the prosecutor relied on the silence of a defendant in custody. The silence of an arrested defendant, under Griffin, is an exercise of his Fifth Amendment rights which the Government cannot use to his prejudice.

A defendant might cite Jenkins v. Anderson, supra, for the proposition that the Griffin protection extends to pre-arrest silence. That case upheld "impeachment by use of pre-arrest silence," 447 U.S. at 240, against a Fourteenth Amendment due process attack based on Doyle. Because the Court in that case relied on the impeachment rationale to uphold the use of the evidence rather than the pre-arrest rationale, one might argue that it supports the proposition that pre-arrest silence is to receive the same Fifth Amendment protection as post-arrest silence; that is, the prosecution may use pre-arrest silence for impeachment, but not as evidence of guilt. Such an argument misreads the Jenkins decision. In fact, the Jenkins Court expressly reserved that question. "Our decision today does not consider whether or under what circumstances pre-arrest silence may be protected by the Fifth Amendment." 447 U.S. at 236 n. 2. Instead, the Jenkins Court relied on the impeachment rationale because it was so clearly available, leaving the unsettled question of applicability of the Fifth Amendment to pre-arrest silence for another day.

Our concurring colleague questions what "unsettled" law we are referencing. We would refer him to the Jenkins opinion, 447 U.S. 231, 236 n. 2: "Our decision today does not consider whether or under what circumstances pre-arrest silence may be protected by the Fifth Amendment. We simply do not reach that issue because the rule of Raffel clearly permits impeachment even if pre-arrest silence were held to be an invocation of the Fifth Amendment right to remain silent." We do not, as our colleague suggests, misread Jenkins, nor did Justice Stevens in his concurrence fear a misreading. Justice Stevens noted, as we have, that the majority in Jenkins held "that a defendant who elects to testify in his own behalf waives any Fifth Amendment objection to the use of his prior silence for the purpose of impeachment." 447 U.S. at 241. He further recognized that holding as squarely supported by Raffel. His reasons for writing separately lay not in a belief that the majority could be misread but in his belief that in the "pre-custody context," silence was not constitutionally protected. His position, shared by our colleague today, addresses a question we need not decide, the question the Supreme Court expressly left open in Jenkins. Our colleague questions "how the reasoning in Jenkins would be any different in a situation in which a prosecutor attempts to use a defendant's silence as probative of his or her guilt." [Concurrence at 9.] We did not feel compelled to explain how it would be different since it is not apparent how it would be similar. The Jenkins Court relied entirely on the impeachment rationale drawn from Doyle and never in any fashion held, implied, or reasoned that the defendant's silence could have been used to establish his guilt. Indeed, the Court expressly "h[e]ld that impeachment by use of prearrest silence does not violate the Fourteenth Amendment." 447 U.S. at 240 (emphasis added). The impeachment exception follows from the waivable nature of the right to remain silent. Because "impeachment follows the defendant's own decision to cast aside his cloak of silence and advances the truth-finding function of the criminal trial," the court "conclude[d] that the Fifth Amendment is not violated by the use of pre-arrest silence to impeach a criminal defendant's credibility." Id. at 238 (emphasis added).

The Court clearly delineated the impeachment exception to evidence that would otherwise be a burden upon Fifth Amendment rights in its discussion of Raffel and related cases, id. at 235-37, even noting "that a statement taken in violation of Miranda v. Arizona, . . . may be used to impeach a defendant's credibility," id. at 237 (citing Harris v. New York, 401 U.S. 222 (1971)). As the Jenkins Court noted, the Harris decision allowed the use of the improperly obtained statements on the ground that a defendant's privilege to testify or refusal to do so "cannot be construed to include the right to commit perjury. . . . Having voluntarily taken the stand, [a defendant is] under an obligation to speak truthfully and accurately," and his prior statement, in Harris, or silence, in Doyle, can be used against him. Id. at 238 (quoting Harris, 401 U.S. at 225). Here there was no testimony by the defendant; there was no impeachment; neither Doyle nor Jenkins nor Harris creates an exception to the general rule that a defendant's silence may not be used against him. The only possible justification for the prosecution's use in this case is the as yet not definitively determined admissibility of pre-arrest muteness.

In light of the Supreme Court's silence on that subject, the government's argument for a pre-arrest exception to the Griffin exclusion is surely made in good faith, but the record does not require that we address it. The prosecutor's comment to the jury is at least ambiguous as to when the silence occurred in relation to the arrest of Moore and his co-defendant. The record is not absolutely clear as to when Moore was placed under arrest, either on the multiple and relatively serious traffic offenses or on the drug and weapons offenses. However, the critical event is not necessarily the formal arrest of the defendant, but rather the time at which he came into custody. By way of comparison, the Supreme Court in Berkemer v. McCarty, noted that "we have frequently reaffirmed the central principle established by [the Miranda] case: if the police take a suspect into custody and then ask him questions without informing him of his rights [against self-incrimination and to counsel], his responses cannot be introduced into evidence to establish his guilt." 468 U.S. 420, 429 (1984) (footnote omitted). Similarly, for the reasons already set forth, with or without Miranda warnings, Moore's silence may not be used to establish his guilt. On the evidence before the jury in the present case, by the time the defendant exercised the silence to which the prosecutor referred, he had been stopped on multiple traffic offenses and the police had discovered contraband under the hood of his car. Whether the words placing him under arrest had or had not been spoken, no one could suppose that he was still free to leave. Indeed, the trial judge, no doubt in a better position than we to resolve the ambiguity of timing, stated "I think you did that" when Armstead's counsel argued that the prosecutor was improperly commenting on post-arrest silence and the prosecutor asserted that he had not done so.

To summarize, the law is plain that the prosecution cannot, consistent with the Constitution, use a defendant's silence against him as evidence of his guilt. The prosecution may, however, use his silence for impeachment if he testifies. Even as to impeachment, the prosecution may not use the silence after the defendant is warned of his Miranda rights. There may be another exception to the bar against the use of silence where the silence occurred before the defendant's arrest. Neither exception applies in this case as Moore did not testify and the record does not support the proposition that the prosecution was referring to pre-arrest silence. Therefore, Moore is correct that the prosecutor's comment on his pre-trial silence violated his constitutional rights.

We therefore must reverse Moore's conviction unless we determine that the prosecution's error was harmless beyond a reasonable doubt. Brecht v. Abrahamson, 507 U.S. 619, 629-30 (1993) (holding that Doyle errors are subject to Chapman harmless error analysis which asks whether the error was harmless beyond a reasonable doubt). The prosecutor's statement was an allusion to evidence of Moore's silence which came in without objection. The jury was thus already aware of the silence at the time Moore objected to the prosecutor's reference to such in closing argument. Hence, the reference to Moore's silence in closing argument created little if any additional prejudice. It would be tantamount to sandbagging to allow a defendant to sit silent while potentially objectionable evidence comes in and then obtain a reversal by objecting to a prosecutor's reference to that evidence. Moreover, the overwhelming evidence "developed at trial establishes guilt beyond a reasonable doubt." Rose v. Clark, 478 U.S. 570, 579 (1986). Thus, we are convinced that the prosecutor's improper reference to Moore's post-arrest silence was harmless.

2. Inflammatory Reference to Defendant

In his opening statement, the prosecutor referred to the defendants as "two armed gunmen driving through the streets of D.C., armed to the teeth, dressed for action, carrying a load of dope. . . ." Moore argues that this was both a misstatement of the facts and inflammatory. Though Moore did not object to this statement at trial, Armstead did. Given the district court's ruling that the objections of one defendant would be considered jointly made, Armstead's objection is attributable to Moore. United States v. Gatling, 96 F.3d 1511, 1521 (D.C. Cir. 1996) ("Trial court judges have discretion to determine whether each defendant must individually object or whether objections raised by one defendant will count as having been raised for all similarly situated defendants."). Nevertheless, the argument is of no avail.

While "the government must take care to ensure that statements made in opening and closing arguments to the jury are supported by evidence introduced at trial," United States v. Small, 74 F.3d 1276, 1280 (D.C. Cir.), cert. denied, 116 S.Ct. 1867 (1996), the government's statement here was amply supported by evidence. The evidence at trial established that, at the time of his arrest, Moore was wearing a bullet-proof vest and shoulder holster (i.e., "dressed for action") and was carrying three handguns (i.e., "armed to the teeth") and 184 bags of cocaine (i.e., "carrying a load of dope") under the hood of his car. The prosecutor's statement, supported by evidence, was not improper. United States v. Perholtz, 842 F.2d 343, 360 (D.C. Cir.), cert. denied, 488 U.S. 821 (1988).

3. Disparagement of Defense Counsel

Moore further maintains that certain comments made by the prosecutor in his closing argument improperly disparaged both defense counsel and the judicial system. Because Moore did not object to these statements as trial, we review only for "plain error." United States v. Williams-Davis, 90 F.3d 490, 507 (D.C. Cir. 1996). Under the plain error standard of review, we will reverse only if the error was both "'plain' or 'obvious' under current law" and prejudicial. United States v. Fennell, 53 F.3d at 1301.

One of the defining characteristics of our system of justice is that criminal trials are adversary proceedings. Gagnon v. Scarpelli, 411 U.S. 778, 789 (1973). Vigorous representation is of paramount importance in such a system, for the "system is premised on the well-tested principle that the truth — as well as fairness — is best discovered by powerful statements on both sides of the question." Penson v. Ohio, 488 U.S. 75, 84 (1988). As a result, we have held that prosecutorial "attacks on opposing counsel are inappropriate." United States v. Childress, 58 F.3d 693, 716 (D.C. Cir. 1995), cert. denied, 116 S.Ct. 825 (1996). Extending this principle, at least one other circuit has held that prosecutorial argument "casting suspicion not merely on a defense possibly employed by the defendant but on the role of defense counsel in general" is improper. United States v. Boldt, 929 F.2d 35, 40 (1st Cir. 1991); cf. United States v. Catlett, 97 F.3d 565, 572-73 (D.C. Cir. 1996) (finding no error where prosecutor referred to defense counsel's closing as a "divert their attention while the thieves get away" — type argument). We agree.

In the government's closing argument in this case, the prosecutor referred to Moore's attorney as a "professional arguer" who "mucks . . . up" the "judicial system." Although the prosecutor's statement could have been construed as a disparagement of the defense attorney and indeed of the role of defense counsel in general, that was not the only possible construction of the argument, and the district judge, as we noted above, is in a better position to weigh and analyze such situationally specific questions than we. The prosecutor may, perhaps must, point out to the jury that the doubt that will prevent a conviction is a doubt founded upon reason not one suggested by the ingenuity of counsel. While we might have commended a different word choice to the prosecutor in this argument, we cannot conclude that the one adopted by him was erroneous, let alone plainly erroneous. Furthermore, the overwhelming evidence of appellant's guilt makes it unlikely that the statement could have been prejudicial even had it been erroneous.

Moore complains that several other statements made by the prosecutor in his closing argument were also improper. These other statements were so plainly not improper that they do not warrant discussion.

F. Ineffective Assistance of Counsel

Finally, Moore alleges ineffectiveness of his trial counsel. To prevail on a claim of ineffective assistance of counsel, a defendant "must prove both incompetence and prejudice." Kimmelman v. Morrison, 477 U.S. 365, 381 (1986). In order to establish that counsel's performance was incompetent, a defendant must demonstrate "errors so serious that counsel was not functioning as the 'counsel' guaranteed by the Sixth Amendment." Strickland v. Washington, 466 U.S. 668, 687 (1984). Prejudice exists if "there is a reasonable probability that, but for counsel's unprofessional errors, the result of the proceeding would have been different." Id. at 694.

Appellant first claims that defense counsel failed to "investigate [the] case [and] contact or subpoena . . . trial witnesses who could have established Appellant's innocence." Even had he located these witnesses, the testimony they allegedly would have provided was tangential at best. That the witness would testify as to Moore's legitimate reasons for wearing a shoulder holster and bullet-proof vest seems incredible. Further, the fact that a few people could testify that they never saw Moore place drugs under his hood is of little value. Perhaps the only testimony that might have been helpful to Moore was that "other people regularly drove Appellant's car." Cf. United States v. Thorne, 997 F.2d 1504, 1510 (D.C. Cir.) (holding that the fact that four other people shared an apartment with defendant rebutted inference that he was in possession of drugs found in proximity with him), cert. denied, 510 U.S. 999 (1993). However, even had this testimony been offered to the jury, the evidence connecting Moore to the drugs was so strong as to render any error by defense counsel harmless.

Appellant also claims that defense counsel was ineffective in failing to take some action to minimize the prejudice from the joinder of the felon-in-possession charge. Because we earlier concluded that severance of defendants was not required, defense counsel's failure to so move cannot constitute ineffectiveness. Appellant's other allegations of ineffectiveness by defense counsel appear to be nothing more than attempts to second guess counsel's trial strategy.

III. CONCLUSION

For the foregoing reasons, we affirm Moore's convictions for possession of cocaine with an intent to distribute, possession of a firearm by a convicted felon, possession of an unregistered firearm, and possession of unregistered ammunition. Although we find that the prosecutor's reference to Moore's post-arrest silence was constitutionally improper, we are convinced that this error was harmless beyond a reasonable doubt. In addition, we reverse Moore's conviction under 18 U.S.C. Section(s) 924(c) and remand the entire case for resentencing.