Yes, radar detectors are legal in California for passenger vehicles. However, it's important to note that the use of radar detectors is prohibited for commercial vehicles in the state. Additionally, while radar detectors are legal, it is still against the law to use them to actively evade or interfere with law enforcement.
It's always a good idea to familiarize yourself with specific state laws and regulations regarding radar detectors, as they can vary from one location to another. In California, as long as you are using a radar detector in a passenger vehicle and not using it to interfere with law enforcement, you are legally allowed to do so.
When using a radar detector, it's important to remember that it is just a tool to alert you to the presence of radar or laser signals. It's still crucial to drive safely and obey all traffic laws. Even with a radar detector, it's always best to practice safe and attentive driving habits.