Missouri v. McNeely
Headline: Court rejects blanket rule allowing warrantless blood draws in drunk-driving stops, limiting police power and protecting drivers’ bodily privacy unless a specific emergency exists
Holding: The Court held that the natural dissipation of alcohol in the bloodstream does not automatically justify warrantless, nonconsensual blood tests in drunk-driving investigations; exigency must be evaluated case by case under the Fourth Amendment.
- Stops routine warrantless blood draws without a specific emergency.
- Requires officers to seek a warrant unless facts show immediate need.
- Encourages use of phone/e-warrants and faster local warrant procedures.
Summary
Background
A Missouri man was stopped at about 2:08 a.m. after erratic driving and signs of intoxication. He refused a portable breath test and a formal breath test, was arrested, and an officer took him to a hospital. Without seeking a warrant, the officer had a blood sample taken at about 2:35 a.m.; testing later showed a BAC of 0.154 percent. State courts suppressed the blood evidence and the State asked the Supreme Court to decide whether the natural loss of alcohol from the body always creates an emergency that lets police take blood without a warrant.
Reasoning
The Court explained that a forced blood draw is a serious intrusion and that prior cases, like Schmerber, used a facts-and-circumstances test to decide if an emergency justified acting without a warrant. The Court held that the fact alcohol dissipates in the blood does not automatically create an emergency in every DUI stop. Instead, officers and courts must decide case by case whether the total circumstances made it impractical to get a warrant before taking blood. The opinion also noted that modern warrant procedures (phone or electronic applications in many States) are relevant to that inquiry.
Real world impact
The decision means police cannot always rely on the body's natural metabolization of alcohol to bypass a warrant. In many routine stops, officers will need to seek judicial approval unless specific facts show a true emergency. The ruling also encourages jurisdictions to streamline warrant procedures to preserve evidence while protecting privacy.
Dissents or concurrances
Several Justices wrote separately. One concurrence stressed the case-by-case rule while urging practical guidance for officers. A partial dissent would have allowed warrantless draws when officers reasonably believe no warrant could be obtained in time; another dissent argued for a categorical rule treating alcohol dissipation as an exigency.
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