Just be sure to refuse all searches or even stops for that matter. They can not detain you unless they have reasonable cause. If they say to pull over to the side to be searched or to be talked to just refuse nicely and say you would prefer to be on your way. Any evidence they find will be thrown out of court because they performed an illegal search. You just have to be smart, do some reading, and understand exactly what your rights are. All roadside checks are unconstitutional.