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Guide
For ordinary passenger cars, California law focuses on jamming devices and clear driver visibility. Check the vehicle code and federal commercial vehicle rules before mounting or using a detector.
California Vehicle Code section 28150 targets equipment designed to jam, scramble, neutralize, disable or otherwise interfere with law-enforcement speed measurement. That wording distinguishes an active jammer from a receive-only detector. Read the current statutory text before relying on a general summary.
Section 26708 governs objects attached to vehicle windows and lists exceptions. A device that blocks the driver’s clear view can raise a separate issue from whether the detector itself is permitted. Consider a dashboard mount and follow the vehicle and detector manuals.
Federal motor carrier regulations prohibit a driver from using a radar detector in a commercial motor vehicle, or operating a commercial motor vehicle that is equipped with or contains one. Do not apply passenger-car guidance to a commercial vehicle.
A detector listens for signals; a jammer is intended to interfere with measurement. California’s section 28150 addresses jamming, and the FCC says intentional interference with licensed radio communications is prohibited. A product name is not enough to establish how a device works.
Rules differ across state lines and may change. Check the current state code, federal rules for your vehicle class, and local mounting restrictions before a trip. This guide is general information, not legal advice.
Common questions
California Vehicle Code section 28150 prohibits devices that jam, scramble, neutralize, disable or interfere with speed measurement equipment. It does not describe ordinary receive-only radar detectors; windshield placement and federal commercial vehicle rules are separate issues.
California Vehicle Code section 26708 restricts objects affixed to vehicle windows, with defined exceptions. Check the current statute and mount instructions; a dashboard location avoids relying on a windshield exception.
No. A detector receives signals; a jammer transmits or interferes with measurement equipment. California law specifically addresses jamming devices, and the FCC also prohibits intentional interference with licensed communications.
Federal rules prohibit using or operating a commercial motor vehicle equipped with a radar detector. The federal rule applies regardless of California’s treatment of ordinary passenger cars.