This is exactly how it works. The laws are such that almost anyone can be found to be breaking some kind of law. So then you give up your rights, such as against search and seizure, in order to avoid being charged. If you are charged, you don't go to a jury of your peers because if you plea bargain out of it, you get a much lighter sentence. Unless it's something high-profile like murder, the judge always sides with the cops in the hearing -- if you want to go past a hearing to a real jury trial, you have to pony up a ton of court costs first, and hire a lawyer.
It's the same story: You get pulled over. The cop tells you were speeding, failed to use a signal, or something even more vague like "careless driving". You may or may not have been, it's doesn't matter at this point, because if he writes the ticket, you are guilty unless you can prove beyond a reasonable doubt you were innocent. So he will bully you into letting him search your car for no reason, in the hopes that if you kowtow to his sense of authority, he may deem you a good citizen and let you off on the ticket.
I guess my point is, if the laws are so broad that everyone is guilty of something, then the people who enforce the laws have all the power. Even if the judicial system weren't corrupt at the lowest levels, the cost of hiring a proper defense attorney is easily a thousand bucks -- and you can't get that back, even if the charges are completely and totally absurd, and laughed out of court.
Of course, if you have a really nice car and are driving in a really nice neighborhood, this is less likely to happen. You know, if you can actually afford legal representation. If you happen not to be so well off, you're screwed. It's blatant class warfare.