OPINION
Petitioners Kay Cisneros, et al., were arrested for driving while intoxicated under *257 AS 28.35.030. 1 Pursuant to Alaska’s implied consent law, AS 28.35.031, 2 each submitted to a breathalyzer test. Respondents Gilbert Serrano, et al., were arrested for driving while intoxicated under AMC 9.28.-020. 3 Pursuant to Anchorage’s implied consent ordinance, AMC 9.28.021, 4 they too submitted to breathalyzer tests. In each case, the test result was 0.10 grams or more of alcohol per 210 liters of breath.
The cases were consolidated before District Court Judge Cutler. A motion was filed to suppress the breathalyzer tests in each of the cases on the grounds that the failure to preserve a breath sample at the time of testing violated the defendants’ due process right to confront and cross-examine the evidence against them. Following a lengthy evidentiary hearing, Judge Cutler granted the suppression motion on July 31, 1981. The state and city requested reconsideration and new evidence was presented to the court. On September 25,1981, Judge Cutler vacated her order suppressing the breathalyzer results, finding that it was not possible for breath samples to have been preserved at the relevant times. A third evidentiary hearing was held and Judge Cutler reinstated her suppression order after having been convinced that breath samples could have been saved. The municipality petitioned for review from this order and we granted the petition for review.
Meanwhile, the State of Alaska petitioned the superior court for review. Judge Carlson reversed Judge Cutler’s order, ruling as a matter of law that due process does not require the preservation of breath samples. The issue has now been placed before this court by means of petitions for hearing filed by Kay Cisneros, et al. and Beverly *258 Brundage, et al. We granted the petitions for hearing.
Having considered the issue raised by these consolidated petitions, we conclude that the due process clause of the Alaska Constitution requires the prosecution to make reasonable efforts to preserve a breath sample or to take other steps to allow a defendant to verify the results of the breathalyzer test. 5 Alaska Const, art. 1, § 7. Accordingly, we affirm the suppression order of the district court and reverse the order of the superior court.
We believe that the result in the instant case turns on the interpretation of
Lauderdale v. State,
Lauderdale is asking for the opportunity to test the reliability or credibility of the results of the breathalyzer test. He wishes to do this by a scientific analysis of some of the components of the breathalyzer machine, that is, the ampoules, which we have held may well yield scientifically reliable data bearing on his innocence or guilt of the crime with which he is charged. A denial of the right to make such analysis, that is to say, to “cross-examine” the results of the test, would be reversible error without any need for a showing of prejudice. It would be denial of a right to a fair trial, and a fair trial is essential to affording an accused due process of law. The district court was correct in suppressing the evidence of the breathalyzer test on due process grounds.
Id. at 381 (footnotes omitted). 6
The state and municipality have pointed out that while
Lauderdale
involved the
*259
preservation of evidence already in existence, the instant case poses a situation in which the evidence must first be gathered prior to preservation. We do not believe that
Lauderdale
can be restricted to merely require the state to preserve existing evidence.
7
It appears to us that there are instances when due process can require additional testing or investigation, such as where the additional evidence so obtained is of sufficient materiality and where the cost and effort involved in obtaining it are reasonable.
See Mallott v. State,
We conclude that due process does require the state and the municipality to take reasonable steps to attempt to preserve breath samples for defendants for their independent analysis or to provide some other alternative check of the breathalyzer results. The evidence presented at the hearings which were held in these cases indicated that a breath sample could be highly material. The evidence presented below established that the operation of the breatha-. lyzer machine is dependent upon the proper performance of critical functions by the operator. A breath sample would help to provide a check on possible operator error and would provide a means of assuring that the breathalyzer mechanical components were not malfunctioning. A breath sample would also provide a means of determining whether the test result was in any way affected by the breathalyzer’s inherent inaccuracy. 8 By making it an offense to operate a car with a certain level of blood or breath alcohol, the current state statute and the city ordinance both place great emphasis on the breath tests. The ability of the defendant to “cross-examine” these tests is critical to his case and to the integrity of the criminal justice system.
Further, we do not believe that a breath sample’ preservation requirement would place an undue burden upon law enforcement officials. Although the state and municipality argued that a suitable system for the preservation of samples of defendants’ breath could not be accomplished at reasonable cost and with sufficient accuracy, we conclude that the defendants in these cases have shown that the technology does exist to set up a reasonable system for preserving breath samples. We note that Colorado, Arizona, and Vermont require breath samples to be preserved for defendants.
Baca v. Smith,
Finally, we note that neither of the judges who considered this question in the cases at bar concluded that imposing a duty of preserving a breath sample would be unreasonably expensive or infeasible. After hearing extensive evidence, District Court Judge Cutler concluded that there are acceptable, inexpensive methods available which could be used to preserve a breath sample for the defendant. Superior Court Judge Carlson reversed Judge Cutler’s ruling, but specifically did not reach the question of whether it was economically feasible to preserve a breath sample. 9
We have independently reviewed the record of the extensive testimony which was presented below, and conclude that the technology is available to preserve breath samples at reasonable cost. Given the importance of the breath tests in driving while intoxicated cases, we conclude that due process does require the prosecution to make reasonable efforts to preserve a breath sample in those cases in which they wish to admit the results of a breath test.
Our decision in this case should be applied mainly prospectively, since there has been considerable reasonable reliance on the prior standard of law by law enforcement officials.
See State v. Glass,
In any decision announcing a new rule of law, it is clear that the defendant who brings the case in which the new decision is announced is entitled to have the new rule of law applied to his case.
State v. Glass,
In the cases to which this ruling applies, we hold that the breathalyzer test is suppressed for use at trial. Assuming that there is sufficient evidence to retry a defendant without the use of the breathalyzer test, the city and state are free to do so.
The suppression order of the district court is AFFIRMED and the order of the superior court is REVERSED.
Notes
. AS 28.35.030(a) provides:
A person commits the crime of driving while intoxicated if he operates or drives a motor vehicle
(1) while under the influence of intoxicating liquor, depressant, hallucinogenic, stimulant or narcotic drugs as defined in AS 17.10.-230(13) and AS 17.12.150(3);
(2) when there is 0.10 percent or more by weight of alcohol in his blood or 100 milligrams or more of alcohol per 100 milliliters of his blood, or when there is 0.10 grams or more of alcohol per 210 liters of his breath; or
(3) while he is under the combined influence of intoxicating liquor and another substance.
. AS 28.35.031 provides:
Implied consent. A person who operates or drives a motor vehicle in this state shall be considered to have given consent to a chemical test or tests of his breath for the purpose of determining the alcoholic content of his blood or breath if lawfully arrested for an offense arising out of acts alleged to have been committed while the person was operating or driving a motor vehicle while intoxicated. The test or tests shall be administered at the direction of a law enforcement officer who has reasonable grounds to believe that the person was operating or driving a motor vehicle in this state while intoxicated.
. AMC 9.28.020(B) prior to June 2, 1981, provided:
A person commits the" crime of driving while intoxicated if he operates, drives or is in actual physical control of a motor vehicle
(1) while under the influence of intoxicating liquor, depressant, hallucinogenic, stimulant or narcotic drugs as defined in AS 17.10.-230(13) and AS 17.12.150(3);
(2) when there is 0.10 percent or more by weight of alcohol in his blood or 100 milligrams or more of alcohol per 100 milliliters of his blood, or when there is 0.10 grams or more of alcohol per 210 liters of his breath; or
(3) while he is under the combined influence of intoxicating liquor and another substance.
On June 2, 1981, subparagraphs two and three were amended as follows:
2. when there is 0.10 percent or more by weight of alcohol in his blood or 100 milligrams or more of alcohol per 100 milliliters of his blood, or when there is 0.10 grams or more of alcohol per 210 liters of his breath as determined by a chemical test within four hours of his arrest; or
3. while he is under the combined influence of intoxicating liquor and another substance to a degree which renders him incapable of driving safely.
.AMC 9.28.021 provides:
A person who operates or drives a motor vehicle in the municipality shall be considered to have given consent to a chemical test or tests of his breath for the purpose of determining the alcoholic content of his blood or breath if lawfully arrested for an offense arising out of acts alleged to have been committed while the person was operating or driving a motor vehicle in the municipality while intoxicated.
. Given the importance of the breathalyzer test in prosecutions for driving while intoxicated, we believe that constitutional due process requires prosecuting authorities to take reasonable steps to assure that drivers arrested for the offense are afforded the opportunity to conduct an independent test to assure the accuracy of the breathalyzer results. We recognize that in
Palmer v. State,
Preservation of breath samples is one way that the due process requirement can be satisfied. Breath sample preservation was given primary focus by the parties in development of the record below, and it appears to be a reasonably effective and efficient means of assuring that breathalyzer results can be independently confirmed. We would emphasize, however, that other methods of providing opportunities for independent testing might also satisfy the requirement of due process.
In this regard, we would specifically note the provisions of AS 28.35.033(e), which expressly permit people who have taken a breathalyzer examination to have a separate chemical test performed by someone of their own choosing. We believe that effective compliance with AS 28.35.033(e) would constitute an acceptable alternative to routine preservation of breath samples. In order to establish effective compliance with AS 28.35.033(e), however, we believe that the prosecution would, at a minimum, have to show the following: (1) that the officer who administered the breathalyzer test clearly and expressly informed the defendant of his right to secure an independent test under AS 28.35.-033(e); (2) that if the defendant requested an independent test, the officer who performed the breathalyzer test or other officers having actual physical custody of the defendant made reasonable and good-faith efforts to assist the defendant in obtaining access to a person qualified to perform an independent examination; and (3) that persons qualified to conduct independent tests or to preserve blood or breath samples for the purpose of conducting independent tests were in fact available in the area where the breathalyzer test was administered. Because the appellate record is silent as to whether any of the defendants herein were actually informed of their right to independent testing under AS 28.35.033(e), we need not give further consideration to this alternative. We do not, however, foreclose the prosecution from seeking to establish effective compliance with AS 28.35.033(e) upon remand to the district court.
. Decisions addressing the preservation of evidence generally look to
Brady v. Maryland,
We now hold that the suppression by the prosecution of evidence favorable to an ac *259 cused upon request violates due process where the evidence is material either to guilt or to punishment, irrespective of the good faith or bad faith of the prosecution.
Id.
at 87,
. In
People
v.
Miller,
In these cases, the separate samples of the defendant’s breath have been neither suppressed nor destroyed — they were never collected and preserved. But this fact does not mean that the defendants’ case must fall. The failure of the state to collect and preserve evidence, when those acts can be accomplished as a mere incident to a procedure routinely performed by state agents, is tantamount to suppression of that evidence. It is incumbent upon the state to employ regular procedures to preserve evidence which a state agent, in the regular performance of his duties, could reasonably foresee ‘might’ be ‘favorable’ to the accused.’ [Citations omitted.]
. The expert testimony revealed that the breathalyzer used by city and municipal law enforcement agencies is accurate within a range of plus or minus 10 percent at the 0.10 percent level. By contrast, a gas chromatography method of breath testing is accurate within a range of plus or minus three percent.
A testing of the preserved breath sample on a more accurate gas chromatograph could provide a valuable second check on the initial breathalyzer test result.
. The issue of breath sample preservation was also raised in the companion case of
Cooley v. Municipality of Anchorage,
. Although our decision to require the preservation of a breath sample relates to the accuracy of the evidence which is introduced at trial, we do not find that the breathalyzer evidence is so suspect that we must require its suppression where a breath sample was not preserved. On the contrary, the evidence establishes that the breathalyzer is an accurate method for measuring the percentage of alcohol in the breath.
For this reason we also conclude that it is inappropriate to dismiss the charges against defendants. The remedy of suppression of the breathalyzer results is sufficient.
. The briefing and evidentiary record in the instant cases and the Cooley cases were considered by us as one case and were influential in our ruling.
