6.2 OUI Penalties, Implied Consent & Chemical Tests
Key Takeaways
Massachusetts' Implied Consent Law means every licensed driver agrees to a breath or blood test after an OUI arrest; refusing or failing it causes an immediate license suspension.
Drivers fail a chemical test at a BAC of 0.08 or higher, and drivers under 21 face penalties at 0.02 or higher under the zero-tolerance law.
A driver over 21 with no prior OUI who refuses a chemical test loses the license for 180 days; drivers aged 18 to 21 lose it for three years plus 180 days.
A first OUI conviction carries a $500 to $5,000 fine, up to 2½ years in jail and a one-year suspension, which an alcohol education course can shorten.
A driver with two or more OUI offenses must use an ignition interlock device during any hardship license and for two years after reinstatement.
Operating under the influence (OUI) of alcohol or drugs is a criminal offense in Massachusetts. A single arrest can trigger two separate tracks: an administrative license suspension from the RMV, which starts immediately, and criminal penalties from the court.
The Implied Consent Law
Massachusetts has an Implied Consent Law: every licensed driver agrees to take a breath or blood test in certain cases. If a police officer believes you are operating under the influence, the officer may ask you to:
- Perform a field sobriety test, and
- Submit to a breath or blood test to measure BAC, if you have been arrested.
The Limits
| Driver | Level that triggers penalties |
|---|---|
| All drivers | 0.08 BAC or higher: operating above the legal limit |
| Under 21 | 0.02 BAC or higher: the zero-tolerance law applies (the criminal standard is still 0.08) |
If your BAC is over the limit or you refuse the test, the officer must take your license and give you a notice of suspension that is effective immediately.
Failing a Chemical Test
| Age | License suspension |
|---|---|
| Over 21 | 30 days or until the court case ends, whichever is shorter. If you are convicted, the court's penalties follow. |
| 18 to 21 | 30 days plus an additional 180 days under M.G.L. c. 90, s. 24P. On a first OUI case, the 180 days can be waived upon entry into a Department of Public Health (DPH) approved alcohol education program. |
| Under 18 | 30 days plus an additional one year under s. 24P. On a first OUI case, the year can be reduced to 180 days upon entry into a DPH program. |
The extra under-21 period exists to get young drivers into alcohol education, and it applies even if you win the court case.
Refusing a Chemical Test
A "prior OUI offense" means a court conviction for OUI or a court-ordered alcohol education assignment. Earlier test refusals do not count as prior offenses.
| Prior OUI offenses | Over 21 | 18 to 21 | Under 18 |
|---|---|---|---|
| None | 180 days | 3 years + 180 days | 3 years + 1 year |
| One | 3 years | 3 years + 180 days | 3 years + 1 year |
| Two | 5 years | 5 years + 180 days | 5 years + 1 year |
| Three or more | Lifetime | Lifetime | Lifetime |
On a first OUI case, the extra 180 days for drivers aged 18 to 21 can be waived upon entering a DPH program, and the extra one year for drivers under 18 can be cut to 180 days. As with test failures, this applies even if you win in court.
Exam tip: refusing a test is never the "safe" choice. A first-time adult who refuses loses the license for 180 days, six times longer than the 30-day suspension for failing the test.
Criminal OUI Penalties
| Conviction | Fine | Prison | License suspension |
|---|---|---|---|
| First offense | $500 to $5,000 | Up to 2½ years | 1 year |
| Second offense | $600 to $10,000 | Minimum 30 days, maximum 2½ years | 2 years |
| Third offense (felony) | $1,000 to $15,000 | Minimum 150 days, maximum 5 years | 8 years |
| Fourth offense (felony) | $1,500 to $25,000 | Minimum 1 year, maximum 5 years | 10 years |
| Fifth offense (felony) | $2,000 to $50,000 | Minimum 2 years, maximum 5 years | Lifetime |
First-offense alternative: the court may let a first offender complete an alcohol education course to cut the suspension to 45 to 90 days (drivers over 21) or 210 days (drivers under 21).
You must also pay RMV reinstatement fees before getting the license back: $500 after a first OUI, $700 after a second, and $1,200 after a third or fourth. A fifth offense means lifetime loss. The OUI chart applies to marijuana and other drugs as well as alcohol.
Ignition Interlock Devices
An ignition interlock device (IID) is a breath-testing unit that must be cleared before the engine starts.
- Anyone with two or more OUI offenses who becomes eligible for a hardship license or reinstatement must install an IID at their own expense.
- With a hardship license, you use the device the entire time you hold it.
- You keep using it for two more years after reinstatement.
- Road tests for IID drivers need a vehicle with the device installed, a center-console brake and a sponsor seat in order to book online. Otherwise the test must be arranged through the RMV Contact Center.
The license restriction code for an IID is T (Section 1.2).
Putting the Two Tracks Together
Example: a 19-year-old with no prior OUI offenses is arrested and blows 0.09.
- Administrative track: the test is failed, so the officer takes the license on the spot. The suspension is 30 days plus 180 days under Section 24P, and the 180 days can be waived by entering a DPH alcohol education program on a first case.
- Criminal track: 0.09 is over the 0.08 criminal standard. A first-offense OUI conviction would bring a one-year suspension, or 210 days with the court's alcohol education option.
Had the 19-year-old refused the test, the suspension would have been three years plus 180 days. And because of zero tolerance, a reading as low as 0.02 still brings administrative sanctions for a driver under 21.
A 35-year-old with no prior OUI offenses is arrested for OUI and refuses a breath test. How long is the license suspended?
180 days
3 years
30 days
1 year
A 17-year-old fails a chemical test after an OUI arrest. It is their first OUI case. What suspension applies?
30 days only, or until the court case ends, whichever is shorter
30 days plus 180 days, which can be fully waived on a first case
30 days plus one year, reducible to 180 days via a DPH program
Three years plus one year, with no reduction for alcohol education
What are the criminal penalties for a first OUI conviction in Massachusetts?
$1,000 to $15,000 fine, at least 150 days, eight-year suspension
$100 to $500 fine with no jail and a 90-day suspension
$600 to $10,000 fine, at least 30 days in jail, two-year suspension
$500 to $5,000 fine, up to 2½ years in jail, one-year suspension
A driver with two prior OUI convictions qualifies for a hardship license. What must they do?
Install an ignition interlock device at their own expense
Carry proof of a completed alcohol class whenever they drive
Have a licensed adult sponsor in the front seat at all times
Drive only between 9 a.m. and 5 p.m. for the whole hardship period
Sections you finish are checked off in the contents.