Who must participate in Maryland's Ignition Interlock System Program?

Under Md. Code, Transp. § 16-404.1(d)(1), an individual who is convicted of, or granted probation before judgment for, a violation of § 21-902(a) or (b) shall be a participant. The MVA states participation is required for a probation before judgment or conviction for DUI or DWI, and for homicide or life-threatening injury by motor vehicle while DUI or DWI.

How long does the interlock requirement last?

Under Transp. § 16-404.1(d)(3), an individual subject to that subsection participates for 6 months the first time, 1 year the second time, and 3 years the third or any subsequent time. The MVA notes that time counts only after the device is installed and that a court order or the MVA can require a longer period.

What does the MVA charge to reinstate a license after an alcohol-related revocation?

The MVA's fee page lists 'Non-CDL or CDL reinstatement due to drug or alcohol related offenses' at $150 and a 'Restoration fee' of $30. The MVA's Reinstate a License page states reinstatement is not automatic and that an application with required fees must be approved.

Is there financial help for the interlock program in Maryland?

According to the MVA's Ignition Interlock Program page, the MVA may waive the $47 enrollment fee for participants on medical assistance or food assistance, and interlock providers must offer 50% off rental rates for people on assistance. The waiver form is the Ignition Interlock Participation Fee Waiver Application (DC-212).

What happens if a participant fails to complete the program?

Under Transp. § 16-404.1(d)(1)(ii), if an individual required to participate fails to participate in or successfully complete the Program, the Administration shall suspend the individual's license until the individual successfully completes the Program. The MVA lists violations such as missed monthly visits, tampering, and attempts to start the car with a BAC over 0.025.

MDVerified against primary sources · August 28, 2026

Maryland ignition interlock & DUI requirements

Ignition interlock device rules, approved vendors, SR-22 insurance filing, and license reinstatement in Maryland, cited to the statute and the Maryland Department of Transportation Motor Vehicle Administration (MDOT MVA).

IID on first offense: Required
Minimum IID period (first): 6 months
SR-22 filing: No
Reinstatement fee: $150

What Maryland law requires

Maryland's ignition interlock, SR-22, and reinstatement rules are set by the statute and agency rules cited below. The values in the tables on this page are taken from those sources and are not interpretations of how they apply to any particular case.

Primary source: Md. Code, Transp. § 16-404.1

Ignition interlock requirement

Ignition interlock requirements in Maryland by offense
Item	Maryland rule
IID on first offense	Required
Minimum IID period, first offense	6 months
Minimum IID period, repeat offense	1 year (3 years for a third or subsequent time)

Under Transp. § 16-404.1(d)(1)(i)1, an individual convicted of, or granted probation before judgment for, a violation of § 21-902(a) (DUI) or § 21-902(b) (DWI, alcohol) 'shall be a participant' in the Ignition Interlock System Program. The MVA states participation is required for a PBJ or conviction for DUI or DWI. Drug-impaired (§ 21-902(c)) cases are eligible but not mandated under subsection (c).

Approved interlock providers

Vendors listed here appear on the Maryland licensing agency's approved-device list. Listing order is alphabetical and is not a ranking or endorsement. Installation locations are on each vendor's own locator.

Official approved-vendor list: Maryland agency vendor list

Approved interlock vendors in Maryland
Vendor	Website	Location finder
Alcohol Detection Systems	Alcohol Detection Systems website	Find a location
Guardian Interlock	Guardian Interlock website	Find a location
Intoxalock	Intoxalock website	Find a location
LifeSafer	LifeSafer website	Find a location
Low Cost Interlock	Low Cost Interlock website	Find a location
RoadGuard Interlock	RoadGuard Interlock website	Find a location
Sens-O-Lock	Sens-O-Lock website	Find a location
Smart Start	Smart Start website	Find a location

SR-22 requirement

An SR-22 is a certificate an insurer files with the state to confirm that a driver carries the liability coverage the state requires. Some states use an FR-44 or a different form for alcohol-related offenses; where Maryland does, the sources below say so.

SR-22 requirement in Maryland
SR-22 filing required after a DUI	No
Filing period	Not applicable

Set to false under FOLLOWUP rule 3. The MDOT MVA 'Reinstate a License' page (the reinstatement page the MVA's DUI page points to) enumerates the reinstatement requirements: meet eligibility requirements, complete the mandatory waiting period, submit an application with the required fees, complete any required treatment or testing, and in some cases accept driving restrictions or retake licensing tests. None is an SR-22, FR-19 or other financial-responsibility filing; the MVA states only that it reviews the driving record for unresolved insurance violations. Maryland's FR-19 (eFR-19, 'Maryland Insurance Certification') is the MVA's insurance-verification form submitted by insurers through the Insurance Compliance Division; no MVA page fetched connects it to a DUI conviction or alcohol-related suspension, and no MVA page mentions SR-22 (the MVA has no SR-22 page). Md. Code, Transp. §§ 17-103 and 17-110 (required security) were also fetched and contain no financial-responsibility filing provision.

Program costs

Fees set by the state are cited to the fee schedule. Vendor charges vary by vendor and are shown as published ranges with the month they were checked.

Post-DUI program costs in Maryland
Item	Amount	As of
License reinstatement fee	$150	2026-08-28
Non-CDL or CDL license reinstatement due to drug or alcohol related offenses (MVA fee page)	$150	2026-08
Restoration fee to lift a suspension (MVA fee page)	$30	2026-08
Ignition Interlock Program enrollment fee (MVA may waive for medical assistance or food assistance recipients)	$47	2026-08
Provider rental-rate discount required for participants on assistance	50% off rental rates	2026-08
Driver's license corrected (fee charged for the interlock-restricted license and again when the restriction is removed)	$30	2026-08

Frequently asked questions

Who must participate in Maryland's Ignition Interlock System Program?: Under Md. Code, Transp. § 16-404.1(d)(1), an individual who is convicted of, or granted probation before judgment for, a violation of § 21-902(a) or (b) shall be a participant. The MVA states participation is required for a probation before judgment or conviction for DUI or DWI, and for homicide or life-threatening injury by motor vehicle while DUI or DWI.
How long does the interlock requirement last?: Under Transp. § 16-404.1(d)(3), an individual subject to that subsection participates for 6 months the first time, 1 year the second time, and 3 years the third or any subsequent time. The MVA notes that time counts only after the device is installed and that a court order or the MVA can require a longer period.
What does the MVA charge to reinstate a license after an alcohol-related revocation?: The MVA's fee page lists 'Non-CDL or CDL reinstatement due to drug or alcohol related offenses' at $150 and a 'Restoration fee' of $30. The MVA's Reinstate a License page states reinstatement is not automatic and that an application with required fees must be approved.
Is there financial help for the interlock program in Maryland?: According to the MVA's Ignition Interlock Program page, the MVA may waive the $47 enrollment fee for participants on medical assistance or food assistance, and interlock providers must offer 50% off rental rates for people on assistance. The waiver form is the Ignition Interlock Participation Fee Waiver Application (DC-212).
What happens if a participant fails to complete the program?: Under Transp. § 16-404.1(d)(1)(ii), if an individual required to participate fails to participate in or successfully complete the Program, the Administration shall suspend the individual's license until the individual successfully completes the Program. The MVA lists violations such as missed monthly visits, tampering, and attempts to start the car with a BAC over 0.025.