RENEE A. WHITE, J.

The defendants were separately arraigned and charged with driving while intoxicated (Vehicle and Traffic Law § 1192), an unclassified misdemeanor. Each defendant now similarly moves to preclude the breathalyzer result on the ground that it is unreliable. In light of the identity of issues presented the court has determined that the issues can best be addressed by rendering a single decision. Specifically, the defendants argue that the breathalyzer machine does not measure the blood alcohol content but rather measures the breath alcohol content which is then converted through a numerical ratio into the blood alcohol content. The defendants further contend that the conversion factor of 2,100:1 which is utilized in determining the concentration of alcohol in the defendant's blood is inaccurate.

Vehicle and Traffic Law § 1192 (2) provides in pertinent part as follows: "No person shall operate a motor vehicle while such person has .10 of one per centum or more by weight of alcohol in his blood as shown by chemical analysis of his blood, breath, urine or saliva".

The breathalyzer is premised on the principle that a mathematical relationship exists between the alcohol content of a person's blood and that contained in his lungs. The concentration of alcohol in blood is assumed to be 2,100 times that in the breath. This calculation is based upon the 1972 National Safety Council's determination that the concentration of alcohol present in 2,100 milliliters of lung air at 34 degrees centigrade will equal the concentration of alcohol present in one milliliter of blood. This numerical relationship had been generally accepted by the scientific community. (See, Gerstenzang, Handling the DWI Case in New York § 29.3 [A]; Erwin, Defense of Drunk Driving Cases § 15.02 [1963].) However, over the years with the advent of new scientific technology, this ratio is now being questioned.

1. THE PARTIES' CONTENTIONS

The defendants in essence are requesting a new Frye hearing on the admissibility of the breathalyzer. The defendants base this request on their contentions that the conversion factor utilized by the breathalyzer is merely an average which is now recognized to be inaccurate. The defendants argue that discrepancies exist in the blood-breath ratios of different individuals, and that the blood-breath ratio of an individual is in constant flux. It is further alleged that individuals having blood-breath ratios substantially higher or lower than 2,100:1 will exhibit erroneous testing results as determined by the breathalyzer.

In response to defendants' motions, the People concede that some individuals may have a conversion ratio below 2,100:1. However, the People allege that reliable studies have not found ratios lower than 1,750:1. Specifically, the People argue that recent studies correlating breath results and direct blood analysis have determined that on the average the breathalyzer underestimates blood alcohol concentrations. Furthermore, the People allege that in the rare instances in which the breath analysis overestimates the actual blood alcohol level, the deviation is small.

The People conclude that these studies indicate "that breath alcohol testing can be very reliable means of assessing blood and that contrary to the judicial argument sometimes raised against its reliability, it appears evidentially sound."

2. CASE LAW IN OTHER JURISDICTIONS

Although the court is unaware of any New York decision on point, other States have considered the issue. In no case has the court held the breathalyzer or intoxilyzer results inadmissible. Rather, the testimony as to the variations in the blood-breath conversion ratio has been admitted as an issue to be considered by the trier of facts. Such testimony goes to the weight of the evidence not to admissibility of the breathalyzer results. (But see, State v Downie, 229 N.J. Super. 207, 550 A.2d 1313 [App. Div. 198 8], overruling State v McGinley, 229 N.J. Super. 191, 550 A.2d 1305; see, discussion infra.)

A review of the litigation in Nebraska is instructive. In State v Burling ( 224 Neb. 725, 400 N.W.2d 872), evidence offered at trial indicated that the conversion ratio varies from one individual to another and ranges from 1:1,100 to a high of 1:3,400. The court concluded that if one had a breath-to-blood distribution ratio which was higher than the average, the machine would understate the actual blood alcohol level. However, if one's ratio were at the 1:1,100 level the machine would overstate his blood alcohol level by 52.38%. The court, following the ruling of State v Bjornsen ( 201 Neb. 709, 271 N.W.2d 839), held that "a test result which was subject to a margin of error had to be adjusted so as to give the defendant the benefit of that margin * * *. [T]he Intoxilyzer must be reduced to 52.38 * * *. [C]onsequently, the Intoxilyzer * * * fails to establish that the defendant had `ten-hundredths of one percent by weight of alcohol in his blood'". (224 Neb, supra, at 730-731, 400 N.W.2d, supra, at 876-877.)

However, the court rejected the defendant's challenge to the use of intoxilyzer conversion of 2,100:1 in State v Hvistendahl ( 225 Neb. 315, 405 N.W.2d 273). The court held that it was up to the trier of fact to resolve conflicts in evidence and weigh the credibility of witnesses. Characterizing the testimony of the defendant's expert and State's expert as a "swearing match", the court affirmed the decision of the trier of fact as there was sufficient evidence in the record to sustain its finding of guilt.

In State v Babcock ( 227 Neb. 649, 419 N.W.2d 527) the defendant's conviction of driving while under the influence of alcohol was affirmed. The defendant had argued that as a matter of law the intoxilyzer reading should be reduced by 52.38% pursuant to State v Burling (supra). The court clarified its ruling, stating: "In State v. Burling, supra, this court did not intend, nor did it, rule that as a matter of law a reading of the test result * * * should automatically be adjusted * * *. [T]his court merely ruled upon evidentiary facts peculiar to each of those cases. Whether an adjustment is required is dependent upon the credible evidence in each case." (227 Neb, supra, at 653, 419 N.W.2d, supra, at 530.)

Our neighboring State of New Jersey has recently confronted this issue. In State v Downie (supra), the court found that the new scientific challenges to the breathalyzer regarding the variability of the 2,100:1 breath-blood ratio were inadmissible thereby overruling State v McGinley (supra). The court held that in light of Romano v Kimmelman ( 96 N.J. 66, 474 A.2d 1), which requires that judicial notice be given to breathalyzer test results in drunk driving prosecutions, the new evidence could only be offered to make a record for a future appeal. The New Jersey Supreme Court is presently considering the issue.

Until recently California cases have held that a defendant is presumed to have a 2,100:1 partition ratio in converting a breath reading to that of a blood alcohol reading absent evidence that the defendant's personal ratio differs from the norm. (People v Herst, 197 Cal.App.3d Supp 1, 243 Cal.Rptr. 83 [Super Ct, App Dept 1987]; People v Prichard, 162 Cal.App.3d Supp 13, 209 Cal.Rptr. 314 [Super Ct, App Dept 1984].)

The appellate court in People v Prichard (supra) established a "rule of convenience" which placed the initial burden on the defendant to present evidence that his partition ratio deviated from the norm.

However, in People v McDonald ( 206 Cal.App.3d 877, 254 Cal.Rptr. 384 [Ct of Appeal, 4th Dist 1988]) testimony was elicited that a person's blood-to-breath partition ratio varies over time. The expert witness for the defense disputed the idea that a defendant could measure his partition ratio. It would merely be speculative to say that the same ratio existed at the earlier time when the defendant was administered the breath test. This evidence directly contradicts the presumption that an individual's partition ratio is constant and can be measured by the defendant.

The court in McDonald (206 Cal.App.3d, supra, at 881, 254 Cal Rptr, supra, at 389) held: "[I]t was error to instruct the jury that it should presume McDonald had a 2100:1 partition ratio unless he presented evidence as to his personal ratio which either proved the contrary or raised a reasonable doubt * * *. The fact presumed by the instruction — constancy of one's partition ratio — was in doubt. The resolution of that doubt was a factual question for the jury." (Emphasis added.)

3. DISCUSSION

New York State has judicially recognized the results of the breathalyzer since 1971. In People v Donaldson ( 36 A.D.2d 37 [4th Dept 1971]), the court affirmed a drunk driving conviction that relied on the admissibility of the breathalyzer. The court examined the operation of the breathalyzer test and held that it was no longer necessary to require expert testimony as to the nature, function or scientific principles underlying the instrument. Subsequent to Donaldson, the Court of Appeals has held that "`the scientific reliability of breathalyzers in general is no longer open to question". (People v Alvarez, 70 N.Y.2d 375, 380, quoting People v Mertz, 68 N.Y.2d 136, 148, citing People v Gower, 42 N.Y.2d 117.) This court is constrained to follow the well-settled law regarding the admissibility of the breathalyzer result.

The breathalyzer test is admissible where the People have laid the proper foundation. However, the Court of Appeals in People v Mertz ( 68 N.Y.2d 136, supra) ruled that a positive breathalyzer test establishes only a prima facie case and is not a per se evidence of guilt. The court stated: "It is, however, error not to permit defendant's attorney to argue on the basis of evidence, whether through cross-examination of the People's witnesses or testimony of defendant's witnesses, expert or other, from which it could be found that defendant's BAC at the time of vehicle operation was less than .10%, that if the jury so found defendant was not guilty of violating the subdivision." (Supra, at 189.)

In addition to the judicial recognition accorded to the results of a breath test to determine blood alcohol content, the Legislature has acknowledged its scientific reliability and provided for its admissibility at trial. (Vehicle and Traffic Law § 1195.)

The court is not aware of any of any precedent for excluding evidence that has been judicially recognized as scientifically reliable. The issue raised concerning the blood-to-breath conversion ratio deals with the credibility of the breathalyzer test. It is for the trier of fact to resolve conflicts in the evidence, pass on credibility of witnesses, determine the plausibility of explanations and weigh the evidence. (People v Gaimari, 176 N.Y. 84, 94; People v Sorenson, 112 A.D.2d 1016 [2d Dept 1985]; State v Hvistendahl, supra.)

4. CONCLUSION

The court finds that the issue concerning the variation of an individual's blood-to-breath conversion ratio is more properly addressed at trial where the defendant will have an adequate opportunity to challenge the validity and reliability of the breathalyzer result. The margin of error in the breathalyzer test should be considered by the trier of facts in deciding whether the evidence sustains a finding of guilt beyond a reasonable doubt. (State v Keller, 36 Wn. App. 110, 672 P.2d 412.)

In conclusion the court holds that the blood-to-breath conversion ratio affects the credibility of the breathalyzer and not its admissibility. Defendants' motions to preclude are denied.