3rd DUI in Maryland: Penalties, Interlock, and Felony Risk

A third DUI in Maryland carries up to two years in prison, a fine of up to $2,400, and a mandatory minimum of 10 days in jail if the three convictions fall within a five-year window.¹ The Motor Vehicle Administration (MVA) adds its own penalties on top: license revocation, up to three years with an ignition interlock device, and years of elevated insurance costs. The total financial and personal cost reaches well into five figures by the time everything is counted.

Jail Time and Fines

Maryland’s DUI statute does not have a separate “third offense” tier. A third conviction is sentenced under the second-offense maximums: up to two years in prison, a fine of up to $2,400, or both.¹ The offense stays a misdemeanor, but judges handling a third conviction tend to sentence closer to those maximums than they would for a second.

If a minor was in the vehicle at the time of the offense, the ceiling rises to three years in prison and a fine of up to $3,000, and that enhancement applies whether or not your prior offenses involved a child passenger.¹

The Mandatory 10 Days

When a third DUI conviction falls within five years of your prior convictions under the same statute, Maryland imposes a mandatory minimum of 10 days in jail. A judge cannot suspend that time or substitute probation for it.¹ Ten days is the floor, not the ceiling. Most third-time offenders serve longer.

How the Five-Year Lookback Works

Whether your current charge triggers the enhanced mandatory minimum depends on timing. The court measures from the date of each prior conviction to the date of the new offense. Two prior convictions inside the five-year window trigger the 10-day mandatory minimum and push the judge toward the top of the sentencing range. If one of your priors falls outside that window, the mandatory minimum drops to 5 days. The older conviction still appears on your record and still influences sentencing, but it no longer forces the enhanced floor.

What Happens to Your License

The MVA acts separately from the criminal court. After a DUI arrest, it initiates an administrative suspension based on your breath or blood test. For a second or subsequent test showing a BAC of 0.08 or higher, the suspension runs 180 days. A BAC of 0.15 or higher pushes it to 270 days. Refusing the breath test on a second or subsequent occasion triggers a two-year suspension.²

You can request an MVA hearing to challenge the administrative suspension, but the window to file is short. Miss it and the suspension takes effect automatically.

Separately, the conviction itself adds 12 points to your driving record, which triggers license revocation under the MVA’s point system.³ The test-result suspension and the points-based revocation can overlap or stack depending on timing.

Ignition Interlock for Up to Three Years

Under Noah’s Law, anyone convicted of an alcohol-related driving offense in Maryland must have an ignition interlock device installed on their vehicle. The device tests your breath before the engine will start and periodically while you drive, and results are downloaded to the MVA every 30 days.⁴ For a third or subsequent DUI, the interlock requirement lasts up to three years. You pay the costs yourself, including installation, monthly calibration, and data monitoring, which together run roughly $60 to $100 per month.

Probation, Evaluation, and Treatment

A third DUI conviction almost always comes with supervised probation. Standard conditions include regular check-ins with a probation officer, random alcohol and drug testing, and restrictions on leaving the state. Violating any condition can send you back in front of the judge for the remainder of your original sentence.

Courts routinely order a substance abuse evaluation for repeat offenders. A licensed counselor reviews your history, screens for dependency, and recommends a treatment plan. Depending on the results, the court may require outpatient treatment, an alcohol education course, or a residential program. The MVA also runs a 12-hour Alcohol Education Program that may be assigned.⁵ Evaluation and treatment costs fall on you and can range from a few hundred to several thousand dollars depending on the level of care.

Insurance and the SR-22 Requirement

Once your suspension or revocation ends, Maryland requires you to file an SR-22 certificate of insurance. Your insurer submits the form to the MVA to prove you carry at least the state-required minimum liability coverage. The filing requirement runs three years from the end of your suspension period. Because insurers treat DUI convictions as high-risk, premiums typically double or triple compared to what you paid before the arrest.

When a Third DUI Becomes a Felony

A standard third DUI remains a misdemeanor in Maryland. The charge elevates to a felony only when impaired driving causes serious physical harm or death, and this is true regardless of how many priors you have.

Homicide by motor vehicle while impaired carries up to five years in prison and a $5,000 fine for a first offense. A prior DUI or related vehicular conviction doubles those maximums to 10 years and $10,000.⁶ Manslaughter by vehicle reaches 10 years and $5,000, rising to 15 years and $10,000 with a prior alcohol-related driving conviction.⁷

Maryland restores voting rights for people with felony convictions once they are released from incarceration, so voting is not permanently lost. But a felony record creates lasting barriers to employment, licensing, housing, and federal security clearances.

Traveling to Canada With Multiple DUIs

Canada treats impaired driving as a serious criminal offense and uses U.S. convictions to assess admissibility. Under the Immigration and Refugee Protection Act, a foreign national is inadmissible for having been convicted of two or more offenses that would be indictable under Canadian law.⁸ Impaired driving qualifies, so two or more U.S. DUI convictions can get you turned away at the border no matter how old they are.

Two options exist. A Temporary Resident Permit allows entry for up to three years at a time but requires a compelling reason to travel, such as work or close family. Criminal Rehabilitation eliminates the inadmissibility entirely but requires that all sentencing, including probation, was completed more than five years ago. With three DUI convictions, Criminal Rehabilitation tends to be the more reliable path.

Professional Licenses and Security Clearances

If you hold a professional license in a field such as nursing, law, education, or commercial driving, a third DUI conviction triggers mandatory reporting to your licensing board in most cases. Boards treat repeat offenses as evidence of a pattern. Possible outcomes include license probation, mandatory treatment, suspension, or permanent revocation, depending on the profession and the board’s findings.

Federal security clearances carry their own exposure. A conviction resulting in more than one year of imprisonment can disqualify you from clearance eligibility, and repeated DUIs raise concerns during adjudication even without lengthy jail time. These reviews are case-by-case, but a third conviction makes a favorable outcome harder to secure.

Add up the mandatory jail time, up to three years of interlock costs, at least three years of sharply higher insurance premiums, substance abuse treatment, court costs, and attorney fees, and the total cost of a third DUI conviction in Maryland routinely reaches five figures. For anyone whose livelihood depends on driving or on a professional credential, the indirect costs often exceed the direct ones.

1
Maryland General Assembly. Maryland Code Transportation 21-902 – Driving While Under the Influence of Alcohol or Under the Influence of Alcohol Per Se
2
Maryland General Assembly. Maryland Code Transportation 16-205.1 – Suspension of License or Privilege to Drive
3
The Maryland People’s Law Library. DUI/DWI
4
Maryland Department of Transportation. Partners Join Together to Highlight the Strengthening of Maryland’s Impaired Driving Laws
5
Maryland Motor Vehicle Administration. 12-Hour Alcohol Education (AEP) Program Requirements
6
Maryland General Assembly. Maryland Code Criminal Law 2-503 – Homicide by Motor Vehicle or Vessel While Impaired
7
Maryland General Assembly. Maryland Code Criminal Law 2-209 – Manslaughter by Vehicle or Vessel
8
Justice Laws Website. Immigration and Refugee Protection Act SC 2001 c 27 – Section 36