In which case did the U.S. Supreme Court rule on the admissibility of blood tests in DUI cases?

In Schmerber v. California, the U.S. Supreme Court addressed the question of whether the results of a blood test taken without a warrant could be admitted as evidence in a DUI case. The Court determined that if police have probable cause to believe that a driver is under the influence, they can conduct a blood test without a warrant, especially in situations where obtaining a warrant could result in the destruction of evidence due to the body's metabolization of alcohol.

The ruling is significant as it balances individual rights against the state’s need to investigate and prosecute DUI offenses. The Court upheld the admissibility of the blood test results, establishing the principle that the warrantless blood draw was justified due to exigent circumstances in a DUI context. This landmark decision reinforced the acceptance of biological tests as relevant evidence in driving under the influence cases, shaping future jurisprudence in this area of law.