Get a lawyer! That's the best advice.

Also, make sure you or your lawyer files a discovery motion well before your court date. This basically means that the police, DA, etc. must submit EVERYTHING regarding your case to you and the court. If there are any mistakes, or anything is missing, the judge has to throw the case out and you'll get off.

This works well with traffic violations 'cause the cop has to show proof that their training is up-to-date and lisenced to use a radar gun, etc. Also, it ends up being such an administrative nightmare for the police, sometimes they just don't follow through with the motion and you get off free of all charges.

But talk to a lawyer! They know all sorts of little tricks like this and would be able to negotiate a plea deal much better than you can by yourself.

Good luck!