While the federal government has not placed any specific bans on radar detectors on a nationwide level, make sure to check all of your state and local laws to determine whether or not they have been banned. At the time of writing, only the state of Virginia and the District of Columbia ban radar detectors in passenger vehicles. Additionally, radar detectors are illegal to use in commercial vehicles as well as on or near military bases. The use of radar/laser jammers, which temporarily disable police radar detectors, is also illegal nationwide.If you want to find out more, you can read this helpful blog post from Best Buy to help you.