i think he means that you should comply with what they say, don't start fighting them yelling "i know my rights, you can't search my car" and then start swinging on the cop. A lot of good people get locked up that way...and now they can't have guns because they didn't realize that a cop can search your vehicle if he's towing it...(inventory search). If a cop asks and you wish to tell him no then that's fine.