check it out, officer cannot stop vehicles that turn around to avoid sobriety checkpoint. Colorado DUID - NORML

In light of the state's substantial interest in combating drunk driving, sobriety checkpoint was not "unreasonable" under Fourth Amendment. The stops averaged no longer than three minutes and were found to be a relatively minor burden on motorists. Checkpoint was held permissible when officer did not stop vehicles that turned around to avoid checkpoint. People v. Rister, 803 P.2d 483 (Col. 1990).