General Rule In the United States. Generally, using radar and laser detectors in the United States is allowed since the tool is intended for drivers to be mindful of their driving speeds. Yes, laws vary from one state to another. But for most of the states, private vehicles are allowed to have radar detectors.

Can a cop tell if you have a radar detector?

Police officers are trained beforehand with various radar related devices. They know how radars and radar detectors work, and how to find illegal radar detectors in other people's vehicles. ... Even without an RDD, a well-trained police officer can tell if a certain driver is hiding a radar detector in their car.

Is it illegal to use a radar detector?

Yes, radar detectors are generally legal in the United States. This is because detectors are intended for drivers to be mindful of their driving speeds. ... Additionally, radar detectors are prohibited in all commercial vehicles and all vehicles 18,000 pounds or heavier.