Commonwealth v. Hallinan: Vacating OUI Convictions Based on the Massachusetts Breathalyzer Scandal

If you were convicted of OUI in Massachusetts based on breath test results from an Alcotest 9510 device, you may be entitled to have your conviction vacated. The Supreme Judicial Court’s 2023 decision in Commonwealth v. Hallinan, 491 Mass. 730 (2023), established that defendants convicted using unreliable breathalyzer evidence are entitled to a conclusive presumption of egregious government misconduct—and a path to withdraw their guilty plea or obtain a new trial.

This decision has profound implications for anyone facing a second or subsequent OUI charge. A vacated prior conviction could mean the difference between a first-offense disposition and mandatory jail time. If you have a prior OUI conviction that relied on Alcotest 9510 results, understanding your rights under Hallinan is essential.

Charged with an OUI between April of 2019 and 2012 and want to seek a new trial with no adverse consequence:

Call Mike Now: (508) 393-4162

The Massachusetts Breathalyzer Scandal: What Happened

For years, the Office of Alcohol Testing (OAT) within the Massachusetts State Police was responsible for calibrating and certifying the Alcotest 9510 breathalyzer devices used throughout the Commonwealth. What prosecutors, defense attorneys, and judges didn’t know was that the calibration and certification process was fundamentally compromised.

The problems were systemic. Breathalyzer devices were certified as accurate when they had not been properly tested. Calibration records were falsified or incomplete. Quality control procedures were ignored or circumvented. The result was that thousands of Massachusetts residents were convicted of OUI based on breath test results from devices that could not be reliably trusted to produce accurate readings.

The scandal came to light through persistent litigation and investigation, ultimately revealing that the government’s assurances about breathalyzer reliability were false. The Supreme Judicial Court determined that this constituted egregious government misconduct that tainted convictions across the Commonwealth.

What the Hallinan Decision Means for OUI Defendants

The SJC’s ruling in Hallinan created a framework for defendants to challenge convictions that relied on compromised breathalyzer evidence. The court held:

Conclusive Presumption of Misconduct: Defendants who pleaded guilty or were convicted after trial, where the evidence included breath test results from an Alcotest 9510 device last calibrated and certified prior to April 18, 2019, are entitled to a conclusive presumption of egregious government misconduct. This presumption cannot be rebutted by the Commonwealth.

Right to Withdraw Guilty Plea: For defendants who pleaded guilty, the court recognized that the egregious misconduct “antedated the entry of his or her plea” and that “the misconduct influenced his or her decision to plead guilty.” A defendant who can establish that there is a reasonable probability they would not have pleaded guilty absent the tainted evidence is entitled to withdraw that plea.

Motion for New Trial: The appropriate procedural vehicle for challenging a conviction under Hallinan is a motion for new trial pursuant to Mass. R. Crim. P. 30(b). This motion allows defendants to attack the validity of a guilty plea or seek a new trial based on the government misconduct.

Charged with an OUI between April of 2019 and 2012 and want to seek a new trial with no adverse consequence:

Call Mike Now: (508) 393-4162

Why This Matters for Second and Subsequent OUI Charges

Massachusetts imposes dramatically harsher penalties for repeat OUI offenses. A second-offense OUI carries a mandatory minimum jail sentence of 60 days. A third offense is a felony with a mandatory minimum of 180 days in state prison. Fourth and subsequent offenses carry even more severe consequences.

These enhanced penalties depend entirely on the validity of prior convictions. If a prior OUI conviction is vacated under Hallinan, it can no longer be used to enhance sentencing on a current charge.

Consider a practical example: A defendant facing what the Commonwealth alleges is a second-offense OUI is looking at mandatory jail time, a three-year license suspension, and all the collateral consequences of a repeat conviction. If that defendant’s first OUI conviction relied on Alcotest 9510 evidence and can be vacated under Hallinan, the current charge becomes a first offense—with dramatically different sentencing exposure and potential dispositions.

This is why anyone charged with a second or subsequent OUI should immediately investigate whether any prior conviction may be subject to challenge under Hallinan.

Who Qualifies for Relief Under Hallinan

To seek relief under the Hallinan decision, a defendant must establish three elements:

1. The egregious government misconduct preceded the entry of the guilty plea. The calibration and certification problems at OAT existed for years before they were discovered. If your conviction occurred during this period, this element is likely satisfied.

2. The egregious misconduct was undertaken by government agents. The Office of Alcohol Testing was a government agency, and the misconduct was committed by state employees in their official capacity. This element is established by the nature of the scandal itself.

3. The misconduct occurred in the defendant’s case. The breath test evidence in your case must have come from an Alcotest 9510 device that was last calibrated and certified prior to April 18, 2019.

Additionally, for defendants who pleaded guilty, you must demonstrate a reasonable probability that you would not have pleaded guilty if the breath test evidence had been excluded or challenged. This is typically established through an affidavit explaining how the breath test evidence influenced your decision to accept a plea.

Charged with an OUI between April of 2019 and 2012 and want to seek a new trial with no adverse consequence:

Call Mike Now: (508) 393-4162

How to File a Motion for New Trial Under Hallinan

A motion for new trial under Mass. R. Crim. P. 30(b) must be filed in the court where the original conviction occurred. The motion should include:

The factual basis for relief: Documentation establishing that your case involved breath test evidence from an Alcotest 9510 device subject to the compromised calibration process. This may require obtaining records from the OAT or the court file from your original case.

Legal argument: Application of the Hallinan framework to your specific case, demonstrating that you meet all the requirements for relief.

Defendant’s affidavit: For guilty plea cases, a sworn statement explaining how the breath test evidence influenced your decision to plead guilty and that you would not have done so if you had known the evidence was unreliable.

Request for specific relief: A clear request that the court vacate the conviction and grant a new trial.

The Commonwealth will have an opportunity to respond, and the court may schedule a hearing. If the motion is allowed, your conviction will be vacated, and the case will be restored to the trial list. At that point, the Commonwealth must decide whether to proceed to trial without the breath test evidence, offer a more favorable disposition, or dismiss the charges entirely.

Practical Implications of a Vacated Conviction

Successfully vacating a prior OUI conviction under Hallinan has immediate practical consequences:

Reduced sentencing exposure on pending charges: If you’re currently facing OUI charges, eliminating a prior conviction from your record can dramatically reduce the penalties you face.

License reinstatement opportunities: Defendants who lost their license based on a now-vacated conviction may have options for earlier reinstatement.

Criminal record implications: While the vacated conviction may still appear in some record searches, it is no longer a valid conviction for purposes of sentencing enhancement or other legal consequences.

Collateral consequences: Employment, housing, and other decisions affected by criminal history may be revisited once the conviction is vacated.

Charged with an OUI between April of 2019 and 2012 and want to seek a new trial with no adverse consequence:

Call Mike Now: (508) 393-4162

Time Considerations for Hallinan Motions

While there is no strict statute of limitations on motions for new trial, practical considerations make timely action important. Evidence and records become harder to obtain over time. Witnesses’ memories fade. And if you’re currently facing charges where the prior conviction affects your sentencing exposure, the motion must be resolved before disposition of the current case to have its intended effect.

If you have any reason to believe a prior OUI conviction may be subject to challenge under Hallinan, consulting with an experienced OUI defense attorney promptly is essential.

The Importance of Experienced Legal Representation

Filing a motion for new trial under Hallinan requires detailed knowledge of both the breathalyzer scandal and the procedural requirements for post-conviction relief. Not every attorney who handles OUI cases has experience with these specialized motions.

An attorney handling a Hallinan motion must be able to investigate whether your case involved Alcotest 9510 evidence subject to the compromised calibration process, obtain and analyze records from the Office of Alcohol Testing, draft a legally sufficient motion and supporting affidavit, argue the motion effectively before the court, and navigate the post-conviction process if the motion is allowed.

For defendants currently facing second or subsequent OUI charges, the attorney must also coordinate the Hallinan motion with the defense strategy on the pending case—ensuring that any relief obtained is properly applied to reduce sentencing exposure.

Charged with an OUI between April of 2019 and 2012 and want to seek a new trial with no adverse consequence:

Call Mike Now: (508) 393-4162

Taking Action on a Potential Hallinan Claim

If you were convicted of OUI in Massachusetts and your case involved breath test evidence, you may have grounds to vacate that conviction under Commonwealth v. Hallinan. This is particularly urgent if you’re currently facing new OUI charges where the prior conviction would enhance your penalties.

The first step is a thorough review of your case to determine whether you qualify for relief. This requires obtaining records from your original case, investigating the calibration status of the device used in your case, and evaluating whether a motion for new trial is likely to succeed.

Every case is different, and the Hallinan framework involves specific legal requirements that must be met. An experienced Massachusetts OUI defense attorney can evaluate your situation, explain your options, and help you pursue the relief you may be entitled to under the law.

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