Are radar detectors legal in Washington?
Last updated August 2026 · McFlash editorial team
Radar detectors are legal in privately-owned passenger vehicles in Washington. However, Washington restricts objects mounted on the windshield, so mount McFlash on the dashboard rather than the glass.
Legal in Washington
Privately-owned passenger vehicles registered or driven in Washington may use a radar detector.
Washington rules at a glance
- Passenger vehicles: permitted.
- Commercial vehicles over 10,000 lbs GVWR: prohibited under federal FMCSA rules.
- US military installations: prohibited.
- Washington restricts objects mounted on the windshield — mount the detector on the dashboard.
- Laser jammers are a separate category and are more heavily restricted than detectors.
Choosing a detector for Washington roads
Look for Ka-band sensitivity (the band most state patrols use), 360-degree coverage so instant-on radar behind you is caught, and a city filter to suppress false alerts in urban traffic. The McFlash 360 covers all three and installs without tools, which matters if you move it between vehicles.
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