Breath Test Evidence in Massachusetts Drunk Driving (OUI) Cases: What You Need to Know
If you’ve been charged with Operating Under the Influence (OUI) in Massachusetts, understanding breath test evidence could be critical to your defense. Breath test results often serve as the prosecution’s primary evidence, but these tests are far from infallible. Here’s what every Massachusetts driver should know about breathalyzer evidence in OUI cases.
In this Blog OUI (Operating Under the Influence) and DUI (Driving Under the Influence) or DWI (Driving While Intoxicated) will be used interchangeably as synonymous acronyms for the same crime know colloquially as “drunk driving”. However, in Massachusetts the crime is referred to as Operating Under the Influence (OUI).
The Role of Breath Tests in Massachusetts OUI Cases
In Massachusetts, breath tests measure your blood alcohol content (BAC) to determine whether you’re legally impaired. The legal limit is 0.08% for drivers over 21, 0.02% for drivers under 21, and 0.04% for commercial drivers. When you’re pulled over on suspicion of drunk driving, law enforcement may request that you submit to a breath test using approved devices.
However, breath test results aren’t automatically admissible in court, and recent history has shown significant problems with how these tests have been administered in Massachusetts.
The Massachusetts Breath Test Scandal: A Game Changer
Massachusetts experienced a major breath test crisis that fundamentally changed DUI defense. In 2017, it was revealed that the Office of Alcohol Testing (OAT) had serious problems with its breath test program, including:
Lack of proper calibration of breathalyzer machines
Missing or inadequate maintenance records
Failure to follow proper testing protocols
Questionable certification procedures
This scandal led to over 27,000 breath test results being excluded from evidence. The legal fallout resulted in stricter requirements for breath test admissibility and opened the door for aggressive defense challenges.
Common Problems with Breath Test Evidence in DWI Cases
Even when properly administered, breath tests can produce unreliable results due to:
-
Breath Test Machine Calibration Issues
Breathalyzer devices require regular calibration and maintenance. Any deviation from proper maintenance schedules can result in inaccurate readings that may overestimate your BAC.
-
Operator Error on Breath Test Machine
The officer administering the test must be properly trained and certified. They must also follow specific protocols, including a 15-minute observation period before testing to ensure you don’t eat, drink, smoke, or regurgitate—all of which can affect results.
-
Medical Conditions that Affect Breath Test Results or Performance
Certain medical conditions can produce false positives, including:
Acid reflux or GERD
Diabetes (which can produce acetone that breath tests may mistake for alcohol)
Dental work that traps alcohol
Certain diets (like ketogenic diets)
-
Environmental Factors Affecting Breath Test Results
Residual mouth alcohol from mouthwash, breath spray, or recent drinking can artificially inflate breath test results. This is why the 15-minute observation period is legally required.
-
Radio Frequency Interference in Breath Test Results
Cell phones, police radios, and other electronic devices can potentially interfere with breath test equipment, producing inaccurate readings.
Your Rights Regarding Breath Tests in Massachusetts
Massachusetts law gives you certain rights when it comes to breath testing:
You can refuse the breath test, but this comes with consequences. Under Massachusetts implied consent law, refusing a breath test results in an automatic license suspension—180 days for a first offense, three years for a second offense, and five years for a third or subsequent offense. However, your refusal cannot be used against you in criminal court.
You have the right to an independent test. If you take the police breath test, you have the right to obtain an independent blood or breath test at your own expense. Law enforcement must inform you of this right.
Challenging Breath Test Evidence in Court
An experienced Massachusetts Drunk Driving defense attorney can challenge breath test evidence on multiple grounds:
Foundation Challenges to Breath Test Results
The prosecution must establish that the breath test device was properly calibrated, maintained, and functioning correctly at the time of your test. Missing maintenance records or certification problems can lead to suppression of the results.
Breath Test Operator Certification
Your attorney can verify whether the officer who administered your test was properly certified and whether their certification was current at the time of your arrest.
Breath Test Protocol Violations
Any deviation from required testing protocols—such as failing to observe you for 15 minutes before testing—can be grounds for excluding the evidence.
Discovery Requests for Breath Tests
Your attorney can request extensive documentation, including calibration records, maintenance logs, training certificates, and even source code for the breath test machines.
Recent Massachusetts Court Decisions on Breath Tests
Massachusetts courts have issued several important rulings regarding breath test evidence:
The Supreme Judicial Court has held that defendants have the right to challenge the scientific reliability of breath test devices and access underlying data about machine performance. Courts have also recognized that the prosecution must prove proper calibration and maintenance through admissible records, not just officer testimony.
What to Do If You’ve Been Charged with OUI in Massachusetts
If you’ve been arrested for DUI and submitted to a breath test:
Document everything immediately. Write down what you ate and drank that day, any medical conditions you have, medications you take, and the circumstances of your stop and arrest.
Do not discuss your case on social media or with anyone except your attorney. Anything you say can be used against you.
Contact an experienced Massachusetts DWI defense attorney as soon as possible. Breath test challenges are highly technical and require knowledge of both the law and the science behind these devices.
Act quickly on license suspension issues. You have limited time to request a hearing with the RMV regarding administrative license suspension.
The Bottom Line
Breath test evidence in Massachusetts Drunk Driving cases is not the slam-dunk prosecutors once believed it to be. The breath test scandal exposed serious flaws in the system, and skilled defense attorneys continue to successfully challenge these results.
Just because you took a breath test and it showed a result over 0.08% doesn’t mean you’ll be convicted. The test results may be suppressible, unreliable, or inadmissible for numerous reasons.
If you’re facing OUI charges in Massachusetts, the stakes are too high to handle alone. An experienced DUI defense attorney can examine every aspect of your breath test evidence, identify weaknesses in the prosecution’s case, and fight to protect your rights, your license, and your future.
I have been providing Operating Under the Influence (OUI and OUI Drugs, DUI and DWI) defense services in Massachusetts for over Thirty (30) years. I have been named a “Superior DUI Attorney” by the National Advocacy for DUI Defense, one of the “Ten best attorneys for Massachusetts”, by the American institute of DUI/DWI attorneys, a “Top 100 Trial Lawyer” by The National Trial Lawyers, I have earned the “Clients’ Choice Award” by AVVO, the Client Champion Platinum Award by Martindale-Hubbell and I have won over Ninety Percent (90%) of my trials.*
Call a Top 10 Massachusetts OUI Attorney Now at: (508) 393-4162.
This blog is not intended to be legal advice, if you have been charged with Operating Under the Influence (OUI, DUI, DWI all common acronyms varying by state for “Drunk Driving”) or any other crime in Massachusetts you should call an experienced and successful Drunk Driving lawyer immediately.