I think that already holds true..
"By going out to the street, you agree that the owner of the street has the right to use any property you take with you in any way he or she wants"
Student's Car Secretly Tracked For More Than 3 Months
"and to authorize third parties (the street owner's sub-licensees) to do the same."
And that is what police officials do when they stop your car to snoop for alcohol or drugs, etc.
Point is, risks and legal agreements are there in all walks of life. It is eventually up to the individual self to weigh in the benefits and risks to take a decision. And both sides of the argument are valid.