Opinion of the Court in Mitchell v. Wisconsin
A Warrrentless Blood Test of an Unconscious Driver Is Constitutional
In this case, we return to a topic that we have addressed twice in recent years: the circumstances under which a police officer may administer a warrantless blood alcohol concentration (BAC) test to a motorist who appears to have been driving under the influence of alcohol. We have previously addressed what officers may do in two broad categories of cases. First, an officer may conduct a BAC test if the facts of a particular case bring it within the exigent-circumstances exception to the Fourth Amendment’s general requirement of a warrant. Second, if an officer has probable cause to arrest a…
