Not that simple. Give me a reason to tow your car. Then I must inventory it prior to tow. Anything found then is not fruits of the poisonous tree. It's admissable. Anything in plain view that's not legal gives me probable cause to believe there are other illegal items there, possibly that will be dangerous to me. Therefore I have reason to search. The old axiom is, "you can't look for a body in a breadbox" if your warrant says you are, say, looking for a body. The breadbox is off limits. It's all about articulation. Bottom line, don't get stopped to begin with.