DUI checkpoints are a flagrant violation of the Constitution, and one of the most braindead rulings of SCOTUS ever (Michigan v. Sitz). Later cases would uphold

DUI checkpoints are a flagrant violation of the Constitution, and one of the most braindead rulings of SCOTUS ever (Michigan v. Sitz). Later cases would uphold that checkpoints for general crime control were violations of the 4th, but 'public safety' was apparently threatened more by drunk driving than by not catching individuals committing crimes that didn't involve intoxicated driving. Our rights have been eroding for decades, and now it can be done at massive scale.