Jammers definitely illegal, detectors depends on jurisdiction. Ignorance is not bliss, beancounter, they'd nail you to the wall with that defense. Detectors work if they are constantly running radar or sniping busy traffic, but if you are pretty much solo and he's sniping you're a meatsicle. A couple ride-alongs with the boys in blue gave me an understanding of their tactics...wait until 100 feet from target and pull the trigger, he has you dead to rights, and when you then slam on your brakes he knows you have a detector and it guarantees a ticket, no amount of begging or cleavage is getting you out of it.