Since the courts allow DUI checkpoints it’s already established that they don’t need a valid reason for a traffic stop.
“Since the courts allow DUI checkpoints it’s already established that they don’t need a valid reason for a traffic stop.”
Wrong. You’re confusing your misunderstanding for law.
RS is still required for virtually all stops. A single limited exception, under certain circumstances, does not mean that there’s no need in all the other cases of traffic stops.