What Is the Legal Blood Alcohol Limit in Massachusetts?

The legal blood alcohol limit for driving in Massachusetts is 0.08 per cent. M.G.L. c. 90, sec. 24 makes it a crime to operate a motor vehicle “with a percentage, by weight, of alcohol in their blood of eight one-hundredths or greater, or while under the influence of intoxicating liquor.” Two lower figures apply to particular drivers. Anyone under 21 who tests at 0.02 or higher loses their license under a separate statute, and anyone driving a commercial motor vehicle who tests at 0.04 or higher is disqualified from commercial driving for a year. The single word that matters most in the statute, though, is not a number. It is “or.” A driver who blows under 0.08 can still be charged if the evidence shows they were under the influence, so 0.08 is a ceiling on what is automatically unlawful, not a floor on what is safe. Massachusetts OUI charges are evaluated on the same intake call at Jim Glaser Law: the attorney listens to the facts and either handles the matter or connects the client with a Massachusetts criminal-defense partner attorney at no extra cost. Call (617) JIM-WINS. The line is answered 24 hours a day. The first telephone consultation is offered without charge.

The 0.08 Rule, and the Word “Or”

Section 24 creates one offense that can be proved two different ways.

The first is the number. If the Commonwealth proves a blood alcohol percentage of 0.08 or more while operating, the offense is made out on that fact alone. Lawyers call this the per se route. Nobody has to show that the driver was swerving, slurring words or failing roadside tests.

The second is impairment. The same sentence reaches anyone who operates “while under the influence of intoxicating liquor,” with no number attached. That route is proved with evidence of how the person was driving and behaving: the observations of the officer, field sobriety tests, the driving itself, statements, and any other evidence of impairment. A driver at 0.06 can be prosecuted this way. So can a driver who refused any test, which is why there is no number at all in some OUI cases.

The same clause also covers marijuana, narcotic drugs, depressants and stimulant substances. The statute attaches a number only to alcohol. There is no numeric legal limit for marijuana in Massachusetts law. A marijuana OUI case is an impairment case every time.

Where the Limit Applies

People are sometimes surprised by where a Massachusetts OUI can happen. Section 24 is not limited to public roads. It applies “upon any way or in any place to which the public has a right of access, or upon any way or in any place to which members of the public have access as invitees or licensees.”

That second phrase brings in places that are privately owned but open to customers: store and mall parking lots, restaurant lots, hotel driveways and similar areas. Someone who pulls out of a bar’s parking lot at 0.10 has committed the offense before reaching the street. The same public-access language decides several other motor vehicle questions on private property, including those set out in the article on parking lot accidents in Massachusetts.

The Lower Limits: Drivers Under 21 and Commercial Drivers

Drivers under 21: 0.02

For a driver under 21, the operative figure is 0.02, which is roughly the level one drink can produce. Section 24 directs that where an officer’s test shows a driver under 21 at 0.02 or more, the officer takes the license on the spot.

Then M.G.L. c. 90, sec. 24P applies. A person under 21 who tests at 0.02 or greater, or who refuses a test, “shall have his license or permit to operate a motor vehicle suspended by the registrar for a period of 180 days,” and for a driver under 18 the period is one year. The statute says this happens “notwithstanding the finding upon any such charge.” In plain terms, the license suspension does not depend on the criminal case. A driver can win the criminal case and still serve the registry suspension.

There is one route through it. For a first-time driver between 18 and 21, the suspension is waived on entry into a program the Department of Public Health designs for underage drinking drivers. For a driver under 18, entering the program shortens the suspension to 180 days rather than waiving it. Failing to complete the program brings the full suspension back.

Separately, M.G.L. c. 138, sec. 34C makes it an offense for anyone under 21, unaccompanied by a parent or guardian, to knowingly possess, transport or carry alcohol. The fine is up to $50 for a first offense and up to $150 after that, and the registrar suspends the license for ninety days. Drivers 18 to 20 carrying alcohol in the course of their job are excepted.

Commercial drivers: 0.04

M.G.L. c. 90F, sec. 11 deals with anyone operating a commercial motor vehicle. Every such driver is deemed to have consented to testing. If the driver refuses, or tests at “four hundredths or more,” the registrar disqualifies the driver from operating a commercial motor vehicle for one year. If the vehicle was carrying a hazardous material that required placarding, the disqualification is three years. Two such events disqualify the driver for life.

This is a disqualification from commercial driving, not a separate criminal limit. A commercial driver at 0.06 loses the ability to drive commercially under chapter 90F even though they are below the 0.08 figure in section 24. For a professional driver that is the loss of a livelihood.

What a Reading Between 0.05 and 0.08 Means

Section 24 tells the court how to treat numbers below the limit, and the rule is more specific than most drivers expect.

• 0.05 or less: there is “a permissible inference that such defendant was not under the influence of intoxicating liquor,” and the statute says the person “shall be released from custody forthwith.”
• More than 0.05 but less than 0.08: “there shall be no permissible inference” in either direction. The result is neither evidence of guilt nor evidence of innocence. The case turns on everything else.
• 0.08 or more: the per se offense is made out.

That middle band is where the impairment route does its work. A result of 0.07 does not end a case. It simply means the Commonwealth has to prove impairment the ordinary way.

At 0.08 or Above, the License Comes Off Before Any Trial

Massachusetts suspends the license at the moment of the test result, long before anyone is convicted of anything.

Under section 24, if the result is 0.08 or more (or 0.02 or more for a driver under 21), the officer takes the license, gives written notice of suspension, and reports to the registrar. The license “shall remain suspended until the disposition of the offense for which the person is being prosecuted, but in no event shall such suspension pursuant to this subparagraph exceed 30 days.” If the officer did not take the license, M.G.L. c. 90, sec. 24N directs the judge to do it at arraignment.

That thirty-day suspension is a pretrial measure. Whatever happens in the criminal case is a separate question with separate license consequences, set out below. Where the suspension rests on a breath test, the driver can ask within ten days for a hearing limited to one question: whether a blood test taken within a reasonable time afterward showed a level under 0.08.

How the Test Is Taken, and What Refusing Costs

The breath test

M.G.L. c. 90, sec. 24K sets conditions for a breath result to count. The analysis must be “performed by a certified operator, using infrared breath-testing devices according to methods approved by the secretary of public safety.” The required sequence is one adequate breath sample, then a calibration standard analysis, then a second adequate breath sample. The devices must be periodically certified, and no device, mouthpiece or tube may be cleaned with anything containing alcohol.

Section 24 adds that where a test was made at the direction of a police officer, the person must have been afforded “a reasonable opportunity, at his request and at his expense, to have another such test or analysis made by a person or physician selected by him.” Blood may be drawn only “by a physician, registered nurse or certified medical technician.”

Implied consent and refusal

Every person who drives on a Massachusetts way or public-access place “shall be deemed to have consented to submit to a chemical test or analysis of his breath or blood” if arrested for OUI. There is an important limit on blood. No one is deemed to have consented to a blood test unless they have been brought for treatment to a licensed medical facility.

A driver can still say no. The price is fixed by statute:

Driver	Suspension for refusing
First-time adult driver	180 days
Under 21, or one prior OUI conviction or program assignment	3 years
Two priors	5 years
Three or more priors	Life

The officer takes the license immediately and impounds the vehicle for 12 hours at the driver’s expense. During the refusal suspension, “no restricted or hardship permits shall be issued,” which makes a refusal suspension harder to live with than many suspensions that follow a conviction. The driver is entitled to a hearing before the registrar within fifteen days, limited to three issues: whether the officer had reasonable grounds to believe the person was operating under the influence, whether the person was arrested, and whether the person refused.

What the refusal cannot be used for is proof of guilt. The statute is explicit: “Evidence that the defendant failed or refused to consent to such test or analysis shall not be admissible against him in a civil or criminal proceeding.” A Massachusetts jury in an OUI trial does not hear that the driver refused.

Answer Capsule

The legal blood alcohol limit for drivers in Massachusetts is 0.08 per cent under M.G.L. c. 90, sec. 24, which makes it a crime to operate “with a percentage, by weight, of alcohol in their blood of eight one-hundredths or greater, or while under the influence of intoxicating liquor.” Because of the word “or,” a driver below 0.08 can still be charged on evidence of impairment. Drivers under 21 face license suspension at 0.02 under c. 90, sec. 24P, 180 days or one year if under 18, regardless of how the criminal case ends. Commercial drivers are disqualified from commercial driving for a year at 0.04 under c. 90F, sec. 11. A result of 0.05 or less creates an inference that the driver was not under the influence; a result above 0.05 and below 0.08 creates no inference either way. At 0.08 or more the license is taken on the spot and suspended for up to 30 days pending the case. Refusing a test costs 180 days for a first-time adult driver, with no hardship license, though the refusal itself cannot be used as evidence at trial. Massachusetts OUI charges are evaluated on the intake call at Jim Glaser Law, (617) JIM-WINS.

What a First Offense Carries

A first conviction under section 24 is punished “by a fine of not less than five hundred nor more than five thousand dollars or by imprisonment for not more than two and one-half years, or both.” Two assessments are added on top and cannot be waived: $250, of which $187.50 goes to the Head Injury Treatment Services Trust Fund, and $50 to the Victims of Drunk Driving Trust Fund.

The license consequence of a conviction is a revocation. The registrar may not restore the license until one year after conviction. After three months the driver may apply for a hardship license good for a single twelve-hour period each day for work or education, and after six months for a broader limited license. Where the blood alcohol level was 0.15 or greater, the registrar may require an ignition interlock device on every vehicle the person owns, leases or operates for the length of the hardship license.

Most first offenses in Massachusetts are resolved another way. M.G.L. c. 90, sec. 24D allows a first offender, with consent, to be placed on probation for up to two years with assignment to a driver alcohol education program, and in that case the license is suspended for “no less than forty-five nor more than ninety days.” For a driver under 21 the suspension is 210 days. Section 24D also reaches a driver whose only prior was ten or more years earlier, once in a lifetime.

Section 24D has one absolute exclusion. It “shall not apply to any person who caused serious personal injury to or the death of another person.” When someone is hurt, the first-offender route is closed.

A second offense is a different order of consequence: a fine of $600 to $10,000 and imprisonment of 60 days to two and a half years, with at least 30 days that cannot be suspended or reduced. The revocation runs two years, and an ignition interlock is a mandatory condition of any hardship license.

When Someone Is Hurt

Two further sections apply when an impaired driver injures or kills someone. M.G.L. c. 90, sec. 24L covers operation at 0.08 or while under the influence, done recklessly or negligently, that causes serious bodily injury; it carries state prison of two and a half to ten years, or a house of correction term of six months to two and a half years. M.G.L. c. 90, sec. 24G covers the same conduct causing a death, with state prison of two and a half to fifteen years or a house of correction term of one to two and a half years.

Those are the Commonwealth’s cases. A person injured by an impaired driver has a separate civil claim for compensation, which runs on different rules and against potentially different parties. Massachusetts law also provides that “No alcoholic beverage shall be sold or delivered on any premises licensed under this chapter to an intoxicated person” (M.G.L. c. 138, sec. 69), which is the starting point for asking whether a bar or restaurant shares responsibility. The article on drunk driving accident claims in Massachusetts explains who can be held responsible and how that claim is brought. If the crash left the driver fleeing the scene, the hit and run penalties are a separate offense again.

How Many Drinks Is 0.08?

There is no reliable answer, and any chart that offers one should be treated with suspicion. The statute measures alcohol in the blood, not drinks consumed. The same number of drinks produces very different blood alcohol levels depending on body weight, sex, how much food was eaten, how quickly the drinks were consumed, and how much time has passed. The strength of a “drink” also varies widely, particularly with craft beer, wine poured at home, and mixed drinks.

The practical difficulty is that impairment begins before 0.08 and the impairment route under section 24 has no number at all. A driver who estimates they are “probably under” has not avoided the statute. The only blood alcohol level a driver can be certain of is zero.

Open Containers

M.G.L. c. 90, sec. 24I prohibits possessing “an open container of alcoholic beverage in the passenger area of any motor vehicle,” on the same public ways and public-access places section 24 covers. The fine is $100 to $500. The passenger area includes the glove compartment but not the trunk or a locked glove compartment. Passengers in a vehicle used to carry people for compensation are excepted, as are the living quarters of a house coach or house trailer. The driver is never excepted: the driver “shall not possess an open container of alcoholic beverage” in any vehicle.

If You Are Facing a Charge, or Were Hit by an Impaired Driver

The two situations call for different help. A driver facing an OUI charge has license deadlines that start running immediately, including the fifteen-day window for a refusal hearing and the ten-day window for a breath-test hearing, and decisions about 24D disposition that should be made with a lawyer. A person injured by an impaired driver has a civil claim that is separate from the prosecution and does not wait for it.

Both are evaluated on the same intake call at Jim Glaser Law. For OUI matters, the attorney listens to the facts and either handles the matter or connects the client with a Massachusetts criminal-defense partner attorney at no extra cost. Call (617) JIM-WINS. The line is answered 24 hours a day. The first telephone consultation is offered without charge.

Frequently Asked Questions

Q: What is the legal drinking and driving limit in Massachusetts?

A: 0.08 per cent blood alcohol for drivers 21 and older, under M.G.L. c. 90, sec. 24. Drivers under 21 face license suspension at 0.02 under c. 90, sec. 24P, and commercial drivers are disqualified from commercial driving at 0.04 under c. 90F, sec. 11. The 0.08 figure is not the only way to be charged: the same statute separately prohibits driving “while under the influence of intoxicating liquor,” with no number attached.

Q: Can you get an OUI in Massachusetts if you are under 0.08?

A: Yes. Section 24 can be proved either by a blood alcohol level of 0.08 or more or by evidence that the driver was under the influence. A result above 0.05 and below 0.08 creates no legal inference either way, so the case turns on the officer’s observations, field sobriety tests and the driving itself. A result of 0.05 or less creates an inference that the driver was not under the influence, and the statute directs release from custody.

Q: What is the legal limit for drivers under 21 in Massachusetts?

A: 0.02. At that level the officer takes the license, and under c. 90, sec. 24P the registrar suspends it for 180 days, or one year for a driver under 18. The suspension applies regardless of how the criminal charge is resolved. A first-time driver aged 18 to 20 can have it waived by entering a Department of Public Health program for underage drinking drivers; a driver under 18 who enters the program still serves 180 days.

Q: What happens if you refuse a breathalyzer in Massachusetts?

A: The license is suspended for 180 days for a first-time adult driver, 3 years for a driver under 21 or with one prior, 5 years with two priors, and for life with three or more, under c. 90, sec. 24(1)(f). No hardship license is available during that suspension, and the vehicle is impounded for 12 hours. A hearing before the registrar must be requested within fifteen days and is limited to whether there were reasonable grounds, an arrest and a refusal. The refusal itself cannot be used as evidence against the driver in a civil or criminal proceeding.

Q: How long is your license suspended after failing a breath test in Massachusetts?

A: Initially, until the case is resolved but not more than 30 days, under c. 90, sec. 24(1)(f)(2). What follows depends on the outcome. A first offender placed on 24D probation serves a suspension of 45 to 90 days (210 days under 21). A first conviction without 24D is a revocation of at least one year, with hardship applications possible after three and six months.

Q: Is there a legal limit for marijuana while driving in Massachusetts?

A: No numeric one. Section 24 prohibits operating while under the influence of marijuana, but the only number in the statute attaches to alcohol. A marijuana OUI case is proved through evidence of impairment, not a test threshold.

Q: Can a passenger drink in a car in Massachusetts?

A: Generally no. M.G.L. c. 90, sec. 24I prohibits anyone from possessing an open container of alcohol in the passenger area of a motor vehicle on a public way or public-access place, with a fine of $100 to $500. The exception is for passengers in a vehicle used to carry people for compensation and for the living quarters of a house coach or trailer. The driver may never possess an open container.

Q: Does the legal limit matter if a drunk driver hit me?

A: It matters to the criminal case, and it is often useful evidence in the civil one, but the injured person’s claim does not depend on the driver being over 0.08. A civil claim turns on negligence, and impaired driving below the limit can still be negligent driving. A conviction is not required to bring the claim, and the claim does not wait for the prosecution to finish. Where alcohol was served to a visibly intoxicated person at a licensed premises, c. 138, sec. 69 may bring the seller into the claim.

Q: Is Jimmy Knows AI giving me legal advice?

A: No, general information only. Jimmy Knows AI explains how Massachusetts law works in plain language; it does not give legal advice and does not review your situation. OUI charges and license suspensions carry short deadlines and turn on the facts of the stop and the test, so nothing here should be relied on in place of advice from a Massachusetts lawyer. Nothing on this page creates an attorney client relationship. Jim Glaser Law can be reached at (617) JIM-WINS.