The illegality of the stubstance gave police an excuse to search the car, or to intimidate the driver into implicitly consenting to a search of the car, during which they inevitably find something the stoner or one of their friends forgot which leads to an arrest.  I&#x27;ve seen it play out on COPS dozens of times.<p>I wonder why they don&#x27;t go back to doing a sobriety test for detecting intoxication though.  It worked ok before breathalyzers, if you can pass the test than presumably you are ok to drive.