look on the ticket, if it says 75 RADAR then you're fucked unless you pull out the old, When was the last time you radar gun was calibrated, cuz they have to have it calibrated on a certain amount of days, i think its 30, if he didnt get it calibrated within the alloted time then you should be good, if he says yes ask him to pull the papers out that rpove he got it calibrated, if he ulls it out i think the best thing to do would be to admit you were speeding but tell the judge the right speed you were going, print out a copy of your driving record, maybe take a driving course (normally judges go easier on you when you do that), tell him you are attending school and whatnot and just be polite, usually if its you're first offense they will drop it, you could also pull the old how do you know it was me you were using your radar on, do you have any proof that you were actually radaring me