Ignition Interlock Clients
Each ignition interlock manufacturer below has one or more approved interlock device models certified in the state of Washington. Please 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.
1221 S Belt Line Rd., Suite 700 – Coppell, TX 75019
Guardian Interlock Systems
125 Church Street, Suite 320 – Marietta, GA 30060
Smart Start Inc.
500 E Dallas Road – Grapevine, TX 76051
11035 Aurora Avenue – Des Moines, IA 50322
4290 Glendale Milford Rd. – Cincinnati, OH 45242
Simple Interlock LLC
7100 Blvd 26, Suite 301A – Richland Hills, TX 76118
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
Anytime a vehicle equipped with a certified ignition interlock device is serviced at a state-licensed automotive repair or service facility, a Vehicle Service Affidavit must be fully completed and turned in to the interlock device’s manufacturer, following the completion of service.
This form will be accepted by all certified ignition interlock service centers in Washington State as a letter authorizing the installation of an ignition interlock device into a vehicle not owned or registered to the interlock restricted driver.
Ignition Interlock Manufacturers
All applicants for Washington State certified ignition interlock technician AND those seeking re-certification must complete an examination administered by the Impaired Driving Section of the Washington State Patrol [WAC 204-50-046 (2)(ii)]. The applicant must score eighty percent or higher on the knowledge and skills examination to be eligible for a letter of certification. Applicants should complete, and successfully pass, the knowledge and skills examination prior to submitting their application for approval.
Procedure for Completing the Washington State Patrol Ignition Interlock Knowledge and Skills Examination:
• Thoroughly review the laws governing ignition interlocks contained in the Revised Code of Washington (RCW) chapter 43.43.395 and chapters 46.20.710 through 46.20.755.
• Thoroughly review all chapters of Washington Administrative Code (WAC) 204-50 addressing ignition interlock rules and regulations.
• Successfully complete all ignition interlock manufacturer, device, service center and technician training as provided by the supporting
• Contact the Washington State Patrol Ignition Interlock Program to request a copy of the examination using one of the following methods:
Phone (206) 720-3018
Fax (206) 720-3246
Washington State Patrol
Ignition Interlock Program
811 E. Roanoke St.
Seattle, WA 98102
When completed, return only the answer sheet to one of the contact methods outlined above.
The applicant will be contacted by the Washington State Patrol within five business days (excluding state holidays) of receiving the answer sheet and provided the results of their examination