Missouri v. McNeely (2012)
- Docket
- 11-1425
- Decided
- 2012-01-01
Summary
Question: Does the Fourth Amendment prevent the taking of a warrantless blood sample under exigent circumstances? Conclusion: Yes. Justice Sonia Sotomayor delivered the opinion of the 5-4 plurality. The Supreme Court held that the Fourth Amendment’s protection against warrantless searches applies to blood alcohol tests unless specific exigent circumstances exist. Because each case must be considered based on its individual facts, there are cases in which the natural dissipation of alcohol in the blood would be considered an exigent circumstance, but there is no reason to create a categorical rule. The Court also held that the Fourth Amendment’s protection against bodily intrusions outweighs the state’s interest in gaining evidence quickly. In his partial concurrence, Justice Anthony M. Kennedy wrote that the case in question does not provide the basis for any categorical rule on the issue of conducting a blood alcohol test without a warrant. He also wrote that the Fourth Amendment does not allow the warrant requirement to be entirely ignored in drunk driving arrests. Chief Justice John G. Roberts, Jr. wrote an opinion concurring in part and dissenting in part in which he argued that there must be a categorical rule on this issue to provide appropriate guidance to law enforcement officials. He argued that exigent circumstances exist and justify a warrantless blood test if the officer believes there is not sufficient time to obtain a warrant before critical evidence is lost through natural metabolic processes. If there is time to secure a warrant, the officer must do so. Justice Stephen G. Breyer and Justice Samuel A. Alito, Jr. joined in the partial concurrence and partial dissent. Justice Clarence Thomas wrote a dissenting opinion in which he argued that the body’s natural metabolization of alcohol constitutes the destruction of evidence and represents an exigent circumstance. The importance of obtaining evidence allows the police to conduct a warrantless blood alcohol test without violating the Fourth Amendment. Learn more about the Roberts Court and the Fourth Amendment in Shifting Scales , a nonpartisan Oyez resource.