they're illegal in va and dc. it is also illegal to put them on the windshield, as it is an obstructuion of view. ive never ever heard of anyone being pulled over because of the obstruction of view. chances are you never will be. detectors now have vg that stops cops from being able to tell if u have a detector or not from satellites, its a lil more in depth than that but im just makin it short. it is illegal in all states for a truck over 10,000 lbs to have a detector. RADAR jammers are illegal every where, but LASER jammers are legal. jammers jam the radar that police use so the radar cant give a reading of the speed of your car.