Are police DUI checkpoints constitutional?

Are police DUI checkpoints constitutional?

Neil Shouse (Defense Attorney) gives expert video advice on: What is 'probable cause' as it applies to a DUI?; Are police DUI checkpoints constitutional?; What is suppression of evidence in a DUI case? and more...

Police DUI checkpoints, under certain conditions, are constitutional and that's why we see them take place quite frequently. However, it has to be a systematic stop of vehicles. So the police cannot use a checkpoint as unfettered discretion simply to stop who they would like to. They can't arbitrarily or randomly pull vehicles over in a checkpoint. It has to be a systematic stop in which everybody who goes through the checkpoint is stopped and investigated for suspicion of drunk driving.