Here's the best way...
Don't get caught.
I've always said this on "other forum," but if you ever get pulled over by a cop who claims to have used a radar, ASK to see the radar gun and what it says. Hopefully the cop erased the speed reading before he walked up to your car. If you ask to see it and he says he alreayd erased it then you should be free to go. Maybe this only applies in california.
(i skimed the article, but is that what it says?)