Tis true. They don't need to tell you the truth until they have read the Miranda Rights. They can pull you over for any reason and make up an excuse for it. I know this because a friend of mine has relatives as police officers as CHP (California Highway Patrol). They can be big time jerks too, such as being in the carpool lane and telling the person to exit the carpool lane and then busting them for pulling out of the carpool lane illegally even when being told to do so. Sad that some people are like that. Not all cops are bad, I've had a few let me go, but some, no matter how nice you are, are assholes.