Is a Radar Detector Legal in California? Rules for Drivers

Generally, radar detectors are legal to own and use in ordinary passenger vehicles in California. The state rules still apply to where a device is mounted, and separate restrictions cover commercial motor vehicles.

California Vehicle Code section 26708 restricts items attached to the windshield or windows if they obstruct or reduce the driver's clear view. The statute's listed exceptions are specific; do not assume a radar detector qualifies. Consider a placement that does not obstruct your view and check the current code.

Federal rules prohibit using a radar detector in a commercial motor vehicle covered by the regulation. The rule also addresses devices that are present in the vehicle, subject to stated exceptions such as equipment transported outside the driver's compartment. Confirm whether your vehicle and operation fall within the rule.

A radar detector only receives signals; a jammer transmits or interferes with enforcement equipment. Do not treat the two as equivalent: federal law prohibits marketing or selling devices designed to jam or interfere with authorized radio communications, and California separately restricts laser jammers.

No. The rules discussed here do not designate an approved brand. If comparing products from Escort or Uniden, check the manufacturer’s current product and installation information, and make sure your setup complies with the laws that apply to your vehicle.