Radar detectors are legal in California. They are placed on the front and back of your vehicle. No radar in the market is fool proof, nor will it keep you from a citation from a zealous police officer. Audio Toyz sells and installs radar detectors manufactured by K40, and Escortt. Products from these manufacturers are known for accuracy and reliability, so when a radar emission is detected while you’re driving you can adjust your speed to avoid an expensive citation.