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Ignition Interlock Devices

The Washington State Patrol is the regulatory authority of ignition interlock devices, interlock service technicians and interlock service centers throughout Washington State. The ignition interlock program of the Washington State Patrol is operated out of the Forensic Laboratory Service Bureau's Impaired Driving Section and consists of law enforcement officers and support staff dedicated to interlock compliance and public safety.

A breath alcohol ignition interlock device (BAIID or simply IID) is attached to the ignition of a motor vehicle and is designed to prevent a motor vehicle from being operated by a person who has consumed an alcoholic beverage. When properly installed and calibrated, the IID will prevent a driver from starting a motor vehicle if the device detects a breath alcohol concentration (BrAC) above the prescribed setpoint.

  • Visit Interlock Clients if you are a interlock restricted driver, interlock customer, or interested in learning more.

  • Visit Interlock Manufacturers if you are a currently approved interlock manufacturer, service center or technician in Washington State or a prospective interlock manufacturer, service center, or technician in Washington State.

  • Visit Frequently Asked Questions if you have a question about ignition interlocks.

Ignition Interlock Program

Regional Map for Interlock Troopers

Ignition Interlock Program
811 East Roanoke Street
Seattle, WA 98102
Main Telephone: 206-720-3018

Driver's Licensing Questions

Please refer to the Department of Licensing (DOL) for any driver's licensing questions: DUI Information and License Suspensions - DOL

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