Supreme Court Weighs in on Nonconsensual, Warrantless Blood Draws in DWI Cases

The United States Supreme Court decided Missouri v McNeely yesterday, holding that in impaired driving investigations, the natural dissipation of alcohol in the bloodstream does not constitute an exigency in every case sufficient to justify conducting a blood test without a warrant. The high court thus resolved the split among state courts regarding whether its 47-year-old decision in Schmerber v. California, 384 U.S. 757 (1966), required facts in addition to the natural dissipation of alcohol to establish an emergency sufficient to trigger the exigent circumstances exception to the warrant requirement – it does – and rejected the State’s call for a categorical rule authorizing warrantless blood draws whenever an officer has probable cause to believe a person has been driving while impaired based solely on the evanescent nature of alcohol. Facts. The defendant in McNeely was stopped for speeding. The officer noticed signs that the defendant was impaired by alcohol, and the defendant admitted to having consumed a couple of beers at a bar. After the defendant performed poorly on field sobriety tests, he was arrested. On the way to the police station, the defendant told the officer he would not provide a breath sample.  The officer then drove to the hospital to obtain a sample of the defendant’s blood for analysis. Upon arriving at the hospital, the officer asked the defendant whether he would consent to a blood test, informing him, pursuant to Missouri’s implied consent law, that if he did not, his license would be revoked and the refusal [...]