DUI Laws in Massachusetts: Penalties, BAC Limits & License Suspension

Massachusetts calls it OUI — Operating Under the Influence of Liquor or Drugs — not DUI or DWI. The per se limit is 0.08% BAC (0.04% for commercial drivers, 0.02% for drivers under 21). If you refused the breath or blood test, you generally have just 15 days to request a hearing to contest the resulting suspension, and that hearing can only be held at the Registry of Motor Vehicles' Boston (Haymarket) Service Center. Missing that window can mean months of suspension you never got to contest, regardless of what happens with the criminal case.

What OUI means in Massachusetts

Massachusetts General Laws Chapter 90, Section 24 makes it a crime to operate a motor vehicle on a public way while under the influence of alcohol, marijuana, or other drugs, or with a blood alcohol content of 0.08% or greater. The state's own term is OUI. You may see "DUI" used loosely in the news or by out-of-state sources, but the charge on your paperwork and in court will say OUI.

OUI is prosecuted separately from — and in addition to — the license suspension the Registry of Motor Vehicles (RMV) imposes on its own. That means you are effectively facing two different processes at once: a criminal case in district court, and an administrative suspension run by the RMV. Winning one does not automatically undo the other.

Per se BAC limits

• 0.08% or higher — the standard legal limit for drivers 21 and over (national standard, not unique to Massachusetts).
• 0.04% or higher — the limit for anyone operating a commercial motor vehicle (CDL holders), even if you weren't driving a commercial vehicle at the time.
• 0.02% or higher — Massachusetts' zero-tolerance threshold for drivers under 21. This is well below the adult limit, and it triggers its own administrative suspension even without a criminal conviction.

Massachusetts does not have a separate higher-BAC "aggravated OUI" tier the way some states do — the charge is the same whether you were just over 0.08% or well above it, though a very high reading can affect how prosecutors and the court treat the case.

Implied consent and refusing the breath or blood test

By driving in Massachusetts, you've already agreed to submit to a breath or blood test if a police officer has reasonable grounds to believe you were operating under the influence. Refusing has consequences that are separate from — and independent of — your criminal case:

• First refusal (no prior OUI history), age 21+: automatic 180-day license suspension.
• One prior OUI/CWOF/program assignment on record: 3-year suspension for refusing.
• Two prior offenses: 5-year suspension.
• Three or more prior offenses: lifetime loss of license for refusing.
• Under 21, any refusal: 3-year suspension, regardless of prior record (with an additional program-related suspension that may be reduced by completing an approved alcohol education program).

One thing that sets Massachusetts apart from many states: the fact that you refused the test generally cannot be told to the jury or used as evidence of guilt at trial, because of a state constitutional protection against self-incrimination. That does not mean refusal is free — the license suspension above happens automatically and immediately, on the officer's report alone, whether or not you're ever convicted. Don't assume refusing "helps" your case; it mainly trades a chemical-test result for a long, automatic suspension. This is general information, not advice about what to do in the moment.

Administrative license suspension: the hearing deadline that matters most

The Massachusetts Registry of Motor Vehicles (RMV) can suspend your license immediately — often before you've even been arraigned — based solely on a failed or refused chemical test. This is completely separate from whatever a judge later decides in your criminal case, and how you challenge it depends on which kind of suspension it is:

• Refused the test: You're entitled to a hearing, but you generally must request it within 15 days of the suspension, and it is held only at the RMV's Hearings Office at the Boston (Haymarket) Service Center — not your local branch. This is the tight, unforgiving clock that catches people out.
• Failed breath/blood test (0.08%+, or 0.02%+ if under 21): This triggers a separate administrative "per se" suspension (commonly 30 days for an adult first reading, or until your case is resolved, whichever comes first). This one is not contested at the RMV — you challenge it before the district court where your OUI case is pending. Because the timing is short, raise it at your earliest court opportunity rather than waiting.

These clocks run from the date of the suspension or refusal — not from your arraignment date. If you let the refusal deadline pass, you typically lose the chance to contest that administrative suspension at all, even if the underlying criminal charge is later reduced or dismissed. Confirm current deadlines and hearing locations directly with the RMV at mass.gov/suspension-hearings before assuming anything below still applies exactly — procedures and locations can change.

First-offense penalties

Under G.L. c. 90, § 24(1)(a)(1), a first-offense OUI conviction carries a fine and jail exposure set by statute, with a separate license suspension from the RMV:

• License suspension: 1 year on a straight conviction (many first offenders instead resolve the case through a first-offender alcohol education disposition under G.L. c. 90, § 24D, which typically carries a shorter suspension — ask the court and the RMV which applies to your case).
• Ignition interlock device (IID): Massachusetts primarily requires an IID for repeat offenders (two or more OUI convictions) as a condition of any hardship license or full reinstatement. Since a 2021 change in the law, certain first-time offenders who apply for a hardship license may also be required to install one — confirm whether it applies to you with the RMV.
• Fines and jail: the statute sets a fine range and a jail term of up to two and a half years as the outer maximum for a first offense; most first offenses do not result in the maximum being imposed, and exact fine amounts, surcharges, and whether any jail time applies depend heavily on the specific facts and any plea disposition. Don't rely on a number you saw online — confirm current fine ranges and sentencing practice with the court or a Massachusetts defense attorney.

Beyond the criminal penalty, expect mandatory enrollment in an alcohol/drug education or treatment program as a condition of getting your license back, plus reinstatement fees paid to the RMV.

Lookback period: Massachusetts counts priors for life

This is the detail that surprises the most people: Massachusetts has no washout period. Under Melanie's Law, a prior OUI conviction, a continuance without a finding (CWOF), or an assignment to an alcohol education/treatment program — from Massachusetts or another state — counts as a prior offense for the rest of your life. A conviction from 20 or 30 years ago can still elevate a new charge to a "second offense" or higher, with the much steeper penalties and suspension lengths that come with it. If you have any OUI-related history, treat this case as a repeat offense until a lawyer confirms otherwise — the lookback in Massachusetts is unlike most other states and it is not something to guess about.

Felony OUI

A third or subsequent OUI offense is a felony in Massachusetts, carrying mandatory minimum jail or state-prison time and license loss measured in years rather than months; fourth and later offenses in particular may be prosecuted in Superior Court. Separately, and regardless of how many prior OUIs you have, Massachusetts law elevates an OUI to a felony-level charge when:

• The operation causes serious bodily injury to another person (OUI causing serious bodily injury, G.L. c. 90, § 24L).
• The operation causes a death (motor vehicle homicide while under the influence, G.L. c. 90, § 24G, or OUI manslaughter) — among the most serious charges in the Massachusetts criminal code.
• You were operating under the influence with a child 14 or younger in the vehicle — a distinct child-endangerment charge under G.L. c. 90, § 24V with its own mandatory jail exposure, on top of the underlying OUI.

Exact mandatory-minimum sentences and prior-offense thresholds change with amendments to Melanie's Law, so if you're facing anything beyond a straightforward first offense, confirm the current charge classification with the court paperwork and a Massachusetts criminal defense attorney rather than relying on a general description.

What to do after a DUI (OUI) arrest in Massachusetts

1. Note the exact date and time of your arrest, any chemical test, and any refusal. The RMV refusal-hearing deadline (generally 15 days) runs from these dates, not from your court date — write them down before you forget the sequence of events.
2. Read every piece of paper the officer or RMV gave you. Suspension notices state the effective date and often the deadline and process for requesting a hearing — don't set them aside unread.
3. Request your RMV hearing immediately if you refused the test and want to contest the suspension. Given the short 15-day window, don't wait for your arraignment date to figure this out. Confirm the current process at mass.gov/suspension-hearings or by calling the RMV.
4. Find out your arraignment date and appear. Missing a scheduled court date on its own can create additional legal problems separate from the OUI charge, and it is also where you would raise a challenge to a failed-test administrative suspension.
5. Get your full driving and OUI history before you talk strategy with anyone. Because Massachusetts counts priors for life, an old CWOF or program assignment you'd forgotten about can change how this case is charged.
6. Talk to a Massachusetts criminal defense attorney as soon as possible, ideally before any hearing or arraignment, especially if this isn't your first alcohol-related incident, if anyone was injured, or if a child was in the vehicle.
7. Don't drive on a suspended license. Operating after suspension is a separate crime in Massachusetts and will make everything else worse. Ask the RMV or your attorney about hardship license eligibility instead.

This article is general legal information about Massachusetts law, not legal advice for your specific situation — confirm current deadlines, penalties, and options with the Massachusetts RMV or a licensed Massachusetts attorney.