To fight a DUI in Massachusetts, the defense attacks the Commonwealth's proof at each step: the reason for the stop, the officer's observations and field sobriety tests, the breath test procedure, and the rights you had at the station. A first offense OUI under M.G.L. c. 90, § 24 carries a $500 to $5,000 fine and up to a year of license loss, and every OUI counts as a prior for life, so testing the evidence before accepting any deal matters. Rory Munns of Mass DUI Guy is licensed in Massachusetts and Rhode Island. Call 401-573-2265 for a free consultation.
Quick answer: You fight a Massachusetts OUI by challenging the evidence, usually through a motion to suppress and, if needed, a trial. Police need reasonable suspicion to stop you and probable cause to arrest you. Field sobriety tests are voluntary and often unreliable. Breath tests require two samples that agree within 0.02, a certified and maintained device, and a proper observation period. You have the right to a phone call after booking and to an independent test. When any of these fails, key evidence can be excluded and the case may be dismissed.
Want to know whether your OUI can be beaten? Rory Munns will review the report and video with you. Call 401-573-2265 for a free consultation, day or night.
Fight a DUI in Massachusetts

Most people charged with OUI assume the breath test settles the case. It does not. The Commonwealth has to prove every element beyond a reasonable doubt, and it has to get its evidence in front of the judge or jury lawfully. A police report is written to support the arrest, and it rarely mentions the things that undercut it. The work of fighting a DUI is finding those things in the video, the records, and the law.
The first step
Get the evidence before you decide anything. That means the police report, the booking video, any cruiser or body camera footage, the dispatch recordings, and the breath test certification and maintenance records. Some of it is kept only for limited periods unless requested. It also means protecting your license: if you refused the breath test, you have 15 days to request an RMV hearing. Rory Munns starts on both the day you call.
Where OUI Cases Are Won
The stop
An officer needs reasonable suspicion of a traffic violation or crime to stop your car. A late-night drive, leaving a bar, or a minor drift within your lane is not always enough. If the stop was unlawful, everything the officer learned afterward, including the smell of alcohol, your statements, and the breath test, can be suppressed. Sobriety checkpoints are allowed, but they must follow written guidelines and a neutral plan. See our page on DUI checkpoints.
The officer's observations and roadside tests
Red eyes, slurred speech, and fumbling for a license are common in OUI reports, and they have innocent explanations: allergies, fatigue, nerves, contact lenses, a speech pattern. Field sobriety tests are voluntary in Massachusetts and were designed for flat, dry, well-lit surfaces. Given on a highway shoulder at night, in the cold, or to someone with a knee or back problem, they prove little. Video often shows a very different scene than the report describes.
The breath test
Massachusetts breath tests have strict requirements. The device must be certified and properly maintained. The operator must observe you for a period before the test to make sure nothing in your mouth skews the result. Two breath samples must be taken, and they must agree within 0.02 of each other. Medical conditions, such as reflux or diabetes, and the timing of the test can also matter. Because alcohol continues to absorb after your last drink, a reading taken at the station can be higher than your level when you were actually driving.
Your rights at the station
After booking, you have the right to use a telephone within a set time to call a lawyer, family member, or bail source. You also have the right to seek an independent test of your blood alcohol at your own expense. When police deny these rights, the remedy can include suppression of evidence or, in some cases, dismissal. Refusing the breath test brings an RMV suspension, but in Massachusetts the refusal itself generally cannot be used against you at trial.
7 Things to Know Before You Fight a DUI
- The Commonwealth carries the burden. You do not have to prove you were sober. The prosecution has to prove impairment or a 0.08 reading beyond a reasonable doubt.
- A motion to suppress comes first. Many cases are won before trial, when a judge excludes evidence from an unlawful stop or a flawed test.
- Video changes cases. Booking and cruiser video often contradict the written report.
- A refusal is not evidence of guilt. It brings an RMV suspension but generally cannot be mentioned at trial.
- You choose judge or jury. Massachusetts defendants can choose a jury trial or a bench trial before a judge.
- 24D is still available later. Fighting the case early does not usually take 24D off the table if the defense does not pan out.
- A win leaves no prior. A dismissal or not guilty verdict means no conviction and no prior offense for the future.
How Fighting an OUI Works in Court
- Arraignment. You plead not guilty, and release conditions are set.
- Discovery. Your lawyer obtains every report, video, and record the Commonwealth has.
- Motion to suppress. The defense challenges the stop, the arrest, the breath test, or statements, and the judge holds an evidentiary hearing.
- Negotiation. Strong motions often lead to dismissals or reductions before trial.
- Trial. If the case goes forward, a jury or judge hears the evidence, and the Commonwealth must prove every element beyond a reasonable doubt.
- License follow-up. A not guilty finding can also lead the court to restore a license suspended for refusal.
Why Hire Rory Munns
Rory Munns fights OUI charges in the District Courts of southeastern Massachusetts from his office in Fall River. He reviews every case for suppression issues, tells clients honestly when a defense is strong and when 24D is the better choice, and handles the RMV side of the license at the same time. He is licensed in Massachusetts and Rhode Island and answers the phone day and night. For more on the grounds that end cases, see our Massachusetts DUI dismissal page.
Related Reading
- Massachusetts DUI Dismissal Lawyer
- Mass Breathalyzer Refusal Attorney
- DUI First Offense in Massachusetts
- Mass DUI Attorney
- New Bedford DUI Checkpoint Lawyer
Ready to fight your OUI? Rory Munns offers a free consultation and is available 24/7. Call 401-573-2265.
Fall River, MA 02721
Phone: 401-573-2265