Next time you get pulled over for speeding, ask to see the reading. If you get that far, ask to see the calibration paperwork.
Without either of those, the case becomes his/her word vs yours. Then discuss the case with the prosecutor and point out the lack of evidence. At best, they'll drop the charges; more likely, they'll offer a plea-bargain offering a lower fine and/or 0 points on your license.
Of course if you were actually speeding, the reading on the equipment is accurate, and it was certified within the legal limit... it's a different story.
I was profiled for several years for living in the wrong part of town and driving a bright red sporty-looking older Japanese car. I was pulled over at 4-5 times a year on very shaky ground. For the most part though, even with traffic court, you're innocent until proven guilty.
And then, of course, there's those small town courts that quite literally say "it's $50 for the ticket, but for $100 we won't put it on your record".