A DWI conviction in Minnesota often triggers ignition interlock requirements that restrict how and when you can drive for months or years. The specifics depend on your BAC level, whether you refused chemical testing, and your prior DWI history. Keyser Law P.A. is a Minneapolis DWI defense law firm that defends clients against DWI charges and the license consequences that follow.

 

How Ignition Interlock Devices Work

 

An ignition interlock device connects to your vehicle’s ignition system and requires a breath sample before the engine will start. If your breath registers a blood alcohol concentration of .02 or higher, the vehicle will not start. The device requires rolling retests at random intervals while driving, includes a camera that photographs the person providing the sample, and logs all test data to the monitoring authority. A failed rolling retest is recorded and reported as a program violation.

 

DWI Convictions That Require Ignition Interlock in Minnesota

 

Minnesota law requires interlock participation for several categories of DWI offenses under Minn. Stat. § 171.306. A first DWI with a BAC of .16 or higher triggers the requirement, as does refusing a chemical test under implied consent law. A second DWI within 20 years, a third DWI, and any subsequent offense all carry mandatory interlock.

 

Criminal vehicular operation or criminal vehicular homicide involving impairment triggers the program as well. In each case, interlock participation is a condition of obtaining limited or reinstated driving privileges during the revocation period.

 

Interlock Program Duration Under Current Minnesota Law

 

Effective August 1, 2025, Minnesota significantly extended ignition interlock requirements under HF2130. The length of the requirement scales with your prior DWI history:

 

• 1 prior DWI within the last 20 years: 2 years
• 2 lifetime prior DWIs: 6 years
• 3 or more lifetime prior DWIs: 10 years

 

Note that whether an interlock is required in the first place depends on DWIs within the last 20 years. But once you are enrolled, the length of the program is calculated using your entire lifetime DWI record, not just the last 20 years. Enrollment is often the better option because the alternative is waiting out the full revocation period with no driving privileges.

 

Costs, Installation, and Ongoing Maintenance

 

The financial burden falls entirely on the driver. Installation costs typically range from $90 to $150, and monthly lease and monitoring fees run from $70 to $125. Calibration appointments are required every 30 to 60 days at a state-approved service provider. The Minnesota Department of Public Safety maintains a list of approved vendors, and some offer reduced-cost options for financial hardship. Over a multi-year requirement, total costs can reach several thousand dollars.

 

Consequences of Violating Interlock Conditions

 

The following are all reportable violations under the interlock program:

 

• Failing a breath test by registering .02 or higher
• Tampering with or attempting to bypass the device
• Driving a vehicle without an interlock installed is now a gross misdemeanor, carrying potential jail time
• Missing scheduled calibration appointments

 

Under Minn. Stat. § 171.306, subd. 5. Each violation extends the program. A first violation adds 180 days, a second adds one year, and a third or subsequent violation adds 545 days, roughly 18 months. Tampering with the device carries separate criminal penalties under subd. 6(b). Repeated violations may also trigger probation violation proceedings if you are serving a probationary sentence for the underlying DWI.

 

Mandatory Treatment Requirement for Interlock Participants

 

The 2025 law requires interlock participants to complete mandatory substance use treatment before reinstating full driving privileges, regardless of whether treatment was ordered as part of their criminal sentence. Failing to complete an approved program will prevent reinstatement even after satisfying the interlock time requirement. Our attorneys can help identify approved providers and ensure treatment satisfies both the interlock program and any court-ordered conditions.

 

Challenging the Underlying DWI to Avoid Interlock Entirely

 

The most effective way to avoid interlock requirements is to challenge the DWI charge itself. Our Minneapolis DWI lawyers can evaluate whether the traffic stop was legally justified, whether the breathalyzer was properly calibrated, and whether the field sobriety tests were conducted in accordance with established standards. The implied consent hearing must be requested within 60 days of receiving your notice and order of revocation, and it offers an additional opportunity to challenge the license revocation. If the DWI charge is reduced or dismissed, the interlock requirement may be eliminated entirely.

 

Fight Your DWI Before It Follows You for Years

 

A DWI charge does not have to mean years behind an ignition interlock device. At Keyser Law P.A., Christopher Keyser is Board Certified in Criminal Law by the MSBA and brings focused DWI defense experience to every case. Contact us online to speak with our Minneapolis DWI attorneys and start building your defense.