Commonwealth v. Hallinan and Massachusetts Alcotest 9510 Cases

In Commonwealth v. Hallinan, 491 Mass. 730 (2023), the Supreme Judicial Court established a conclusive presumption of egregious government misconduct for affected defendants whose evidence included an Alcotest 9510 breath-test result. A judge will not vacate a guilty plea, admission to sufficient facts, or trial conviction solely because the result falls within the affected period. A defendant must file a motion under Massachusetts Rule of Criminal Procedure 30 and make the separate, case-specific showing required for relief.

The First Ananias Ruling

In the consolidated litigation known as Ananias, defendants challenged breath-test results from the Draeger Alcotest 9510. The Office of Alcohol Testing (OAT) calibrated and certified the instruments used by Massachusetts police departments. OAT did not formally adopt written protocols to standardize that work until September 2014. Before then, laboratory personnel transmitted procedures informally.

The District Court judge initially determined that OAT’s methodology produced presumptively unreliable results. The judge allowed the defendants’ motion as to results from Alcotest 9510 instruments calibrated and certified between June 1, 2011, and September 14, 2014. The Commonwealth could still attempt to establish the reliability of a particular result in the limited circumstances permitted by the resulting orders.

The 432 Withheld Calibration Worksheets

The later litigation concerned OAT’s discovery disclosures as well as its laboratory practices. The parties stipulated that the judge had ordered OAT to produce all annual certification and calibration worksheets. OAT produced 1,976 worksheets and represented that the production was complete. OAT had intentionally withheld another 432 worksheets that reported failures in the annual calibration process.

OAT did not tell the prosecutors, defense attorneys, or judge that it had withheld those failed worksheets. The parties stipulated that the documents were exculpatory. The judge therefore had to consider government misconduct beyond OAT’s failure to use written protocols. The courts later adopted a statewide remedy.

The Commonwealth later notified approximately 27,000 defendants whose OUI cases were implicated. The courts also entered orders governing the exclusion period and the conditions for the Commonwealth’s later use of Alcotest 9510 evidence.

The Hallinan Presumption

The Supreme Judicial Court held that defendants who pleaded guilty or were convicted after trial, and whose evidence included an Alcotest 9510 breath-test result from June 1, 2011, through April 18, 2019, receive a conclusive presumption of egregious government misconduct. An affected defendant therefore need not prove OAT’s misconduct separately. At a later trial, the judge must exclude the affected result.

Counsel should review the instrument model, test date, calibration and certification history, disposition, and the prosecution’s use of the result. A defendant is not entitled to relief solely because the test date falls within the affected period.

The Required Case-Specific Showing

The Supreme Judicial Court did not establish a conclusive presumption of prejudice. A defendant who pleaded guilty or admitted to sufficient facts must demonstrate a reasonable probability that the defendant would not have entered that disposition if the OAT misconduct had been known. The judge examines the totality of the circumstances rather than treating the presence of a breath-test result as sufficient by itself.

Relevant considerations include the remaining evidence, the role of the breath-test result in the factual basis, the advice a reasonable lawyer would have given, the concessions obtained through the plea agreement, and whether the benefits of the agreement outweighed the value of challenging the breath-test evidence. A defendant convicted after trial must also proceed through Rule 30 and establish the basis for a new trial. Every defendant must therefore complete the required motion practice.

What an Allowed Motion Changes

If a judge allows a motion to withdraw a plea or for a new trial, the criminal case reopens. The judge does not thereby dismiss the OUI charge. The Commonwealth may proceed again without the excluded Alcotest 9510 result. Courts and the Registry then apply the governing law to the later disposition.

If the defendant is convicted again, the judge may not impose a new sentence exceeding the original legal sentence. The judge must also credit incarceration and license-suspension time already served. The sentencing cap does not apply when the original sentence was illegal.

When an Older OUI File Should Be Reviewed

Under Massachusetts Rule of Criminal Procedure 30, a judge may grant a new trial at any time if it appears that justice may not have been done. Relief remains discretionary, and an older case can present practical proof problems. Counsel should obtain the docket, plea or trial record, police reports, breath-test documents, instrument records, and information about the sentence and license consequences before deciding whether to file a motion.

In a later matter, a court or the Registry may consider a prior Massachusetts OUI disposition when applying the statutes governing prosecution, refusal history, ignition interlock, or licensing. The result depends on the governing provision and the exact type of prior disposition. A prior does not necessarily lengthen every later suspension.

Current Breath-Test Challenges

In Hallinan, the Supreme Judicial Court addressed the identified Alcotest 9510 period and OAT misconduct. The Court did not establish a presumption that every later breath-test result is unreliable. In a current prosecution, counsel should review the instrument, applicable regulations, operator’s certification, observation period, test sequence, calibration and certification records, discovery compliance, and the relationship between the reported number and the time of operation.

The firm discusses admissibility and litigation on its Massachusetts breathalyzer-defense page. It addresses the instrument, testing process, timing, and blood evidence in a separate breath-test and blood-alcohol-science guide. The firm provides concise answers in the Massachusetts breath-test and BAC FAQs.

Last reviewed August 17, 2026.