I remember low sperm count being attributed to underwear that was tight fitting and therefore, kept too much heat in that area of the body. So this is a good point. You have an incidence of cancer in the location of a piece of equipment. What does that equipment do. It gives off radar energy as needed or heat. Heat!!! The radar gun would not be emitting radio waves when not in use but it certainly could give off heat. I assume the cops left the devices on, in the case they needed to use them rapidly.