FAQ About the Ignition Interlock System Program in Maryland

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Common Questions About the Ignition Interlock System Program in Maryland

In Maryland, is you are subjected to Administrative penalties by the Maryland Motor Vehicle Administration, you may be required to participate in the Ignition Interlock Program (IIP).

Check out interactive Ignition Interlock Map for Maryland

What an Ignition Interlock Device?

An Ignition Interlock is a breath analyzer that connects to a motor vehicle’s ignition system. The device measures the driver’s alcohol concentration prior to starting the vehicle and while the vehicle is operated.

If the device detects alcohol in excess of the calibrated settings (greater than 0.025 Blood Alcohol Content “BAC”), the device will prevent the vehicle from starting or continuing to be operated.

What Violates the Ignition Interlock Program?

If a driver has an Ignition Interlock device installed and subject to the MVA’s rules, there are various conditions that must be met to continue in the program. The following events will result in a violation and removal of the device.

  1. Failure to have the ignition interlock device installed and obtain a Maryland driver’s license restricted to the operation only of vehicles equipped with an ignition interlock device;
  2. Failure to appear for the required monthly monitoring visit every 30 days.
  3. Operating a motor vehicle not equipped with a functioning  ignition interlock device approved for use in the Ignition Interlock System Program;
  4. Failure to abide by the terms and conditions of the Service Agreement with the Interlock Service Provider, including payment of all costs and fees associated with the Ignition Interlock System Program;
  5. Tampering with, bypassing, or otherwise removing or rendering inoperable the interlock device, or allowing someone else to tamper, bypass or remove/render inoperable the device;
  6. Attempting to start or operate the vehicle with a BAC greater than 0.025;
  7. Failure to submit to retests after starting the vehicle; or
  8. Any license suspension or revocation imposed while participating in the Ignition Interlock System Program.

What is the Limit of Alcohol in My System While Using the Ignition Interlock Device?

A driver may not have more than 0.025 BAC while trying to start or retest their vehicle. If the driver has more than 0.025 BAC, then the vehicle will not start or will discontinue use.

Do I Have to Stop for Retests While Driving?

No, you do not have to stop the vehicle while retesting. The driver can continue to drive the vehicle during the retest process.

Who are the Approved Interlock Service Providers in Maryland?


To participate in the Ignition Interlock program, a driver must use an approved Ignition Interlock provider. The MVA has approved the following providers in Maryland:

Maryland Ignition Interlock Lawyer

If you have questions about participating in the ignition interlock program or you’re facing a DUI/DWI charge in Maryland, contact our office to schedule a free consultation. Participating in the ignition program may be the best choice for many individuals charged with DUI or DWI in Maryland. Attorney Randolph Rice has represent thousands of individuals charged with drunk driving in Maryland. Call the office today to schedule a free consultation.


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