True, but I believe such stops have to be for every car passing through a checkpoint or some other non-discriminatory 'random' way (every 4th car, for example).

True, but I believe such stops have to be for every car passing through a checkpoint or some other non-discriminatory 'random' way (every 4th car, for example). The stop in question here was clearly unconstitutional, as the appellate court held in their decision for the defendant. Other non-DUI style checkpoint stops without reasonable suspicion of a crime would similarly be unconstitutional.