just b/c they are legal doesnt mean that hes not gonna stop you. and most of the time, he can guess how fast you were going, and thats all he needs. the only way to contest that is to go to court and say that you were using a laser scrambler so he couldnt have clocked you at the right speed.
my g/f just got stopped the other night. the cop said he clocked her going 55 but she was really going 65 in a 40. so he obviously didnt clock her and he was just guessing but he could tell that she was speeding. and thats all he needed to pull her over and give her a ticket. but she only got a warning. i wish i could get warnings