Changes to Maryland’s DUI Law – Interlock Requirements as of October 1, 2024
As of October 1, 2024, Maryland significantly expanded its ignition interlock requirements for individuals charged with or convicted of DUI and DWI offenses. These changes make ignition interlock participation mandatory in situations where it was previously left to judicial discretion.
This update is critical for anyone facing an alcohol‑related driving charge, and understanding the new rules can help prevent additional penalties, license consequences, and costly setbacks.
What Is an Ignition Interlock Device?
An ignition interlock device (IID) is a breathalyzer installed in a vehicle’s ignition system. Before the vehicle can start, the driver must blow into the device. If alcohol is detected—even at a very low level—the car will not start.
IID systems must be:
- Professionally installed
- Maintained by Maryland MVA‑approved providers
- Regularly calibrated and monitored
You can find the list of approved providers through the Maryland MVA website.
What Changed on October 1, 2024?
Before October 1, 2024, individuals who received probation before judgment (PBJ) for a DUI or DWI were not automatically required to participate in the ignition interlock program. Judges could decide on a case‑by‑case basis.
Under the new law—Maryland Transportation Article § 16‑404.1—the ignition interlock program is now mandatory for:
- Anyone convicted of DUI or DWI under Transportation Article § 21‑902(a) or (b)
- Anyone who receives PBJ for DUI or DWI
- Anyone whose license is suspended due to accumulation of points for an alcohol‑related DUI offense
This aligns with broader policy goals similar to the expansion of “Noah’s Law,” which aimed to reduce repeat DUI offenses across the state.
How Long Do Drivers Need to Use the Interlock Device?
The length of mandatory IID participation depends on prior offenses:
- First‑Time DUI Offenders – Minimum of 6 months
- Second‑Time Offenders – Minimum of 1 year
- Third or Subsequent Offenders – 3 years
Important: The Countdown Doesn’t Start Until Installation Is Reported
The Maryland MVA does not begin crediting time toward your interlock requirement until:
- The device is installed, and
- You provide proof of installation to the MVA
After the MVA receives proof, the driver is issued an interlock‑restricted license. Failure to abide by the restriction triggers serious consequences.
Penalties for Non‑Compliance
If a driver fails to comply with ignition interlock requirements, they may face:
- License suspension
- Violation of probation, including potential jail time
- Reinstatement of a conviction
- Additional monetary penalties
These consequences apply whether the failure involves missed service appointments, blowing above the threshold, or driving a non‑equipped vehicle.
Work‑Vehicle and CDL Considerations
Work‑Vehicle Exemptions
Drivers who must operate employer‑owned vehicles may qualify for restricted work exemptions, depending on the situation.
Commercial Drivers (CDL Holders)
Unfortunately, ignition interlock restrictions are treated as a license suspension for CDL purposes.
This means CDL holders cannot operate commercial vehicles while under an IID restriction—even if the restriction applies only to their personal vehicle.
Why These Changes Matter
Maryland lawmakers expanded the IID requirements to:
- Reduce repeat DUI offenses
- Increase roadway safety
The MVA’s program already prevents thousands of high BAC vehicle starts each year, according to state records.
If You’re Facing a DUI or DWI, Get Legal Guidance Immediately
These new laws greatly increase the consequences of DUI cases—including mandatory interlock use and severe penalties for mistakes or missed requirements.
An experienced defense attorney can help you:
✔ Navigate MVA hearings
✔ Avoid unnecessary penalties
✔ Understand interlock rules
✔ Protect your license and your record
Contact the Law Offices of Gritz, Hanifin & Shih, LLC today for a free consultation.
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Frequently Asked Questions (FAQ)
- Do I have to install an interlock device if I receive PBJ for a DUI?
Yes. As of October 1, 2024, all DUI/DWI PBJ recipients must enter the ignition interlock program. - How long will I need to use the ignition interlock device?
- First offense: 6 months
- Second offense: 1 year
- Third or later: 3 years
- When does the required interlock period begin?
The clock starts only after the MVA receives proof of installation. - Can I drive my employer’s vehicle?
In some cases, yes—work‑vehicle exemptions may apply. - Can CDL drivers drive commercial vehicles with an IID restriction?
No. For CDL holders, the restriction counts as a suspension, barring operation of commercial vehicles. - What happens if I violate IID rules?
You may face probation violations, extended IID time, license suspension, or reinstated convictions.