With radar guns there are many different kinds, and whatnot, I'm sure you all know. Anyhow, atleast with the air, they are likely using lasers, in which, basically if they want your arse, they have it. Lasers are starting to be used more often now as far as I can tell, but anyhow it is my personal opinion, that they might have let you slide before, but at this time of year they are looking to make their quota- although any officer would shoot that down so you arn't going to get off easily. As for experience, I have known people to get out of tickets easily just by not having their licence with them, because I think it means that there is a bit of paper work for the officer to fill out if they still give them a ticket, but I'm not certain on that.