Many law enforcement agencies use radar-detector detectors, especially in areas where the devices are restricted. Of course, they can also see your radar detector if you mount it on your windshield.

Most detectors use radar frequencies to figure out how far ahead something emitting these frequencies is. Usually, the result is a sworn officer of the law pointing a radar gun into traffic.

Police officers use radar to assess whether you’re speeding. And despite what many people may think, if you don’t live in Virginia, Washington D.C. or Mississippi, it’s perfectly legal to use a radar ...