The officer on the beat is always the last line of defense for the Constitution. They are in the same unique position jurors are in...they have the discretion and ability, no "nullify" the law by choosing not to enforce it.
A law that forces prosecution of everyone in the car, removes discretion. This is as horrible as mandatory minimum sentences. It takes away control from anyone other than "big brother."
This country is going down the toilet thanks to judicial oligarchy. Something has to be done. Same thing with mandatory minimums. They have to go. The police state and 1984 is here.