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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.

Interlock Manufacturers


Each ignition interlock manufacturer below has one or more approved interlock device models certified in the state of Washington. Note: The Washington State Patrol does not endorse any manufacturer, service center, or device. Their appearance on this page confirms only that the devices have been certified by the Washington State Patrol and meet federal and state rules for breath alcohol ignition interlock devices. The list below randomly rotates when this web page is accessed or refreshed.

Information about device certification and standards is available at this link or by writing to the Ignition Interlock Program, Washington State Patrol, 811 E. Roanoke, Seattle WA 98102.

Documents & Forms


Laws & Informational Sites


Revised Code of Washington

  • RCW 46.04.215 - Ignition interlock device; Other biological or technical device; Definitions.
  • RCW 46.20.710 - Ignition interlocks, biological, technical devices; Legislative findings.
  • RCW 46.20.740 - Ignition interlocks, biological, technical devices; Notation on driver's license; Penalty.
  • RCW 46.20.750 - Ignition interlocks, biological, technical devices; Assisting another in starting or operating; Penalty.
  • RCW 46.37.005 - State patrol; Additional powers and duties.

Washington Administrative Code

Resource Information


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Ignition Interlock Device

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