Ignition Interlock

 No. Under WAC 204-50-110, ignition interlock devices only prevent a vehicle from starting. If you fail or miss a random retest while driving, the horn will sound continuously to alert law enforcement, but the engine will not shut off.

No. Under RCW 46.20.740(2), it is a criminal offense for a person with an interlock restriction to drive any vehicle not equipped with an interlock. Have your repair facility complete a Vehicle Service Affidavit (link above) after repairs are finished to document any related device events.

Under WAC 204-50-110 interlock devices are required to include a two-minute stall protection window allowing the vehicle to restart without a new breath sample.

 No. Random retests may occur while the vehicle is running. If you leave the vehicle unattended, you may miss a retest, which will be recorded as a violation and likely activate your horn.

Under RCW 46.20.750, it is unlawful to drive without a required interlock or to have someone else blow into the device. Report suspected violations to WSP at (206) 720-3018 or complete the complaint form above. Include as much identifying information as possible (name, birth date, address, license plate, etc.)

Under RCW 46.20.745, the Department of Licensing charges a $21 per-device fee to maintain interlock records and fund the indigent assistance program.
The Washington State Patrol charges a $10 installation fee and a $5 monthly monitoring fee used for certification, monitoring, investigations, and regulatory services.

Other lease costs are set by the manufacturer.

Under RCW 46.20.720(5), ignition interlock restriction periods are calculated on a day-for-day basis. If your device is removed during the restriction period, those days will not count, and your restriction will be extended accordingly.

Under RCW 46.20.720, your interlock manufacturer must certify to the Department of Licensing that your device history is free of qualifying violations during your final Compliance-Based Review (CBR) period.

Any of the following incidents may extend your restriction period:

1. 1. 1. 1. 1. Attempts to start with a breath alcohol content of 0.04 or higher unless a retest within 10 minutes is below 0.04 and verified by the camera.
            2. Missed random tests unless the image confirms the driver was not present.
            3. Failed random retests with a breath alcohol content of 0.02 or higher unless a retest within 10 minutes is below 0.02 and verified by the camera.
            4. Missed maintenance, calibration, violation or inspection appointments.
            5. Unauthorized device removal.
            6. Tampering or circumvention as defined in RCW 46.20.750. If any such incidents occur, your restriction period will be extended until a full violation-free CBR period is completed.
            • • • Arrests prior to July 23, 2017 → 4-month CBR period
                • Arrests on or after July 23, 2017 → 180-day CBR period 180 days.

Visit the Ignition Interlock Violation Information page to learn about violations, possible exceptions, and what steps to take to remain in compliance.

Under RCW 46.20.720(8), Ignition interlock restrictions are recognized across states. If required in Washington, other states will also enforce the restriction, and vice versa.

No. Under WAC 204-50-110(1)(c), devices must require a minimum of 1.5 liters of breath per sample. Drivers having difficulty meeting this should contact their manufacturer for assistance or consult DOL to determine if they qualify for alternative requirements.