The issue has come up before, but the push to implement sobriety checkpoints has been brought up again in Wisconsin. The idea is still facing opposition from civil liberties proponents, who see sobriety checkpoints as an infringement on personal rights. Representative Dean Kaufert of Neenah has long opposed such a measure. A tavern owner himself, he said, "The Legislature is not ready for checkpoints."
To determine whether a particular driver has been drinking, a police officer must initiate a traffic stop. In order to pull someone over, however, the officer must have a reason, whether the driver was exceeding the speed limit, failed to stop at a stop sign, or had a brake light out. But the legality of this initial stop is essential, because the evidence of the driver's potential intoxication depends on it.