as said before, Police have to pull over a certain amount of cars each time they go out on patrol, but as some of my friends are police officers, you have the right to stand up for yourself IF a police officer is in the wrong, even my friends know they have the power but they use it rightfully while some don't so you can step up against them. Even at the pits, they know some police are knobs, sending cars that are legal to the pits just so they get certain records on patrol.
Just make sure you have the right evidence and you should be flying with ease but be sure to be expecting to pay alot of $$$ in court cases.