WASHINGTON — The Supreme Court has ruled that police must usually try to obtain a search warrant from a judge before ordering blood tests for drunken-driving suspects.
The justices on Wednesday sided with a Missouri man who was subjected to a blood test without a warrant and found to have nearly twice the legal limit of alcohol in his blood.
Justice Sonia Sotomayor said for the court that the natural dissipation of alcohol in the blood is generally not sufficient reason to jettison the requirement that police get a judge’s approval before drawing a blood sample.
Missouri and the Obama administration were asking the court to endorse a blanket rule that would have allowed the tests without a warrant.
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