The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon
probable cause, supported by
Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be
seized.
Your 4th Amendment rights _should_
allow you to say no to the bored,
profiling highway cop when he wants to
tear apart your car looking for god-knows-what, but some states have loopholes these assholes can use. If you're not doing anything wrong, you don't need to be submissive to their whims and attitudes.