State service guide

Massachusetts DUI laws: OUI terminology, immediate RMV suspensions, and the split between first-offender 24D relief and repeat-offense IID rules

Massachusetts calls drunk driving OUI, and the state handles it on two tracks at once: immediate RMV action after a failed or refused chemical test, and the separate court case. The practical thresholds are 0.08 for most drivers, 0.02 for drivers under 21, and 0.04 while operating a commercial motor vehicle. For drivers 21 or older, a breath-test failure at 0.08 or above brings an immediate 30-day RMV suspension unless the case is resolved through first-offender 24D, while a chemical-test refusal triggers 180 days with no prior OUI history, 3 years for an under-21 driver or a driver with one prior, 5 years with two priors, and lifetime with three or more. On the court side, the RMV's over-21 materials list found-guilty suspension periods of 1 year, 2 years, 8 years, 10 years, and lifetime by offense count, but some first offenders may instead receive a 24D disposition with a 45- to 90-day suspension and alcohol education; second and subsequent OUI-related reinstatements generally require an ignition interlock device.

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BAC thresholds Massachusetts uses 0.08 BAC for most drivers, 0.02 for drivers under 21, and 0.04 while operating a commercial motor vehicle
Over-21 breath-test failure The RMV says a driver 21 or older who registers 0.08 BAC or greater faces an immediate 30-day suspension unless the case is resolved through first-offender 24D
Chemical-test refusal Refusal brings 180 days with no prior OUI history, 3 years for an under-21 driver or a driver with one prior, 5 years with two priors, and lifetime with three or more
IID rule Massachusetts requires IID installation before a new license or reinstatement for drivers with 2 or more OUI convictions or program assignments

Overview

What this page helps you verify

A strong Massachusetts DUI page should be written as an OUI page and should separate RMV administrative action from court consequences. Massachusetts has unusually important branching rules: over-21 breath-test failures, chemical-test refusals, first-offender 24D dispositions, under-21 Youth Alcohol Program consequences under section 24P, and the separate 0.04 CMV alcohol rule for CDL holders. That structure is more useful than a flat first-offense versus repeat-offense summary.

Last reviewed: 2026-05-18. This page was manually upgraded against service-specific official sources, but requirements can still change quickly.

Usually needed

Documents and information to prepare

  • The OUI arrest paperwork, including the immediate RMV suspension notice and any breath-test-failure or refusal documentation
  • Court paperwork showing whether the case is a first offense, a repeat offense, or a possible first-offender 24D disposition
  • Any driver alcohol education or treatment records required by the court or RMV
  • Ignition interlock installation and compliance records if you are seeking hardship or reinstatement after a second or subsequent OUI-related suspension
  • CDL or commercial-driving records if the stop involved a commercial motor vehicle or a CDL holder

Typical flow

What the process often looks like

  1. Treat the RMV action and the criminal OUI case as separate Massachusetts problems from the start.
  2. Identify immediately whether the issue is a breath-test failure, a chemical-test refusal, an under-21 case, a CDL case, or a repeat OUI, because Massachusetts changes the suspension and restoration rules across those categories.
  3. If the arrest is a first OUI, check whether a section 24D disposition is realistically available, because that changes the practical license consequence substantially.
  4. If the matter involves a second or subsequent OUI history, plan around ignition interlock and reinstatement requirements rather than assuming driving privileges return automatically when the suspension period ends.

Two tracks

Massachusetts can suspend you through the RMV immediately even before the court case is finished

That split is the first thing a useful OUI page should explain.

  • Massachusetts is an implied-consent state, so an OUI arrest can trigger immediate RMV action for either a breath-test failure or a chemical-test refusal.
  • The RMV's over-21 page says a driver 21 or older who registers 0.08 BAC or greater faces an immediate 30-day suspension unless the case is resolved through first-offender section 24D.
  • The same RMV materials say the arresting officer takes custody of the Massachusetts license and gives written notice effective immediately, with no temporary license issued.

First-offender path

Massachusetts does not treat every first OUI conviction like a straight 1-year suspension

The state's first-offender disposition is the main place where generic DUI summaries become misleading.

  • The RMV's over-21 materials list a 1-year suspension if a driver is found guilty of a first OUI, with longer periods for later offenses.
  • But General Laws chapter 90, section 24D allows some first offenders to be assigned to a driver alcohol education program and placed on probation instead of taking the ordinary first-offense path.
  • Section 24D says the license suspension for that disposition is no less than 45 days and no more than 90 days, or 210 days if the person was under 21 when the offense was committed.

Refusal and youth rules

Refusing the test and being under 21 can make Massachusetts much harsher than a basic adult first-offense chart suggests

This is where the Commonwealth's OUI structure becomes notably less forgiving.

  • General Laws chapter 90, section 24 says a chemical-test refusal brings a 180-day suspension with no prior OUI history, 3 years for an under-21 driver or a driver with one prior, 5 years with two priors, and lifetime with three or more.
  • Massachusetts also uses a 0.02 BAC threshold for drivers under 21.
  • The RMV's under-21 page says Youth Alcohol Program consequences under section 24P can be added after an OUI arrest for an underage driver who failed or refused testing, and those consequences are in addition to the other suspension tied to the arrest.

IID and CDL consequences

Repeat OUI restoration is built around ignition interlock, and commercial drivers face a separate 0.04 rule

These are two Massachusetts-specific details a practical page should surface clearly.

  • Massachusetts General Laws chapter 90, section 24 1/2 and the RMV's IID guide require an ignition interlock device before a new license or reinstatement for drivers with 2 or more OUI convictions or assignments to a substance-abuse or driver alcohol education program.
  • The RMV's CDL suspension page says driving a commercial motor vehicle with a BAC of 0.04 or more is a major offense that disqualifies the driver from holding a CDL for at least 1 year on a first offense and for life on a second offense.
  • Massachusetts also says refusing an alcohol test as required by law while driving any vehicle is a major CDL offense.

Accuracy notes

Where people get tripped up

  • Massachusetts DUI content should be framed as OUI content and should separate RMV administrative action from court outcomes, because the immediate suspension rules do not wait for final conviction.
  • The 24D first-offender path is central Massachusetts law, not an edge case. A page that lists only a 1-year first-offense suspension is incomplete.
  • Under-21 cases should not be collapsed into the ordinary adult chart because Massachusetts uses a 0.02 BAC threshold and adds Youth Alcohol Program consequences under section 24P.
  • Repeat-offense restoration should mention IID directly, because Massachusetts makes interlock a reinstatement condition for drivers with 2 or more qualifying OUI histories.

FAQ

Common questions

  • Does Massachusetts use the term DUI or OUI?

    Massachusetts generally uses OUI, meaning operating under the influence, in its statutes and RMV materials.

  • What happens if I fail a breath test in Massachusetts and I am over 21?

    The RMV says a driver 21 or older who registers 0.08 BAC or greater faces an immediate 30-day suspension unless the case is resolved through first-offender section 24D.

  • Can a first Massachusetts OUI lead to less than a 1-year suspension?

    Sometimes. General Laws chapter 90, section 24D allows some first offenders to receive a driver alcohol education disposition with a 45- to 90-day suspension instead of the ordinary first-offense conviction path.

  • What if I refuse the chemical test in Massachusetts?

    Massachusetts treats refusal harshly. Section 24 says the suspension is 180 days with no prior OUI history, 3 years for an under-21 driver or a driver with one prior, 5 years with two priors, and lifetime with three or more.

  • When is an ignition interlock device required in Massachusetts OUI cases?

    The RMV's IID materials say Massachusetts requires interlock installation before a new license or reinstatement for drivers with 2 or more OUI convictions or qualifying program assignments.

Sources

Official references used for this page

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