The Michigan Supreme Court Tuesday ruled that it is not illegal to drive while having marijuana metabolites in the body, reversing a 2006 decision by a more conservative version of the court. Marijuana metabolites are not a controlled substance under state law, and their mere presence thus cannot be the basis of a conviction under the state's drugged driving law, the court held.

The court's opinion read: "We hold that 11-carboxy-THC is not a schedule 1 controlled substance under MCL 333.7212 [controlled substances act] and, therefore, a person cannot be prosecuted under MCL 257.625(8) [drugged driving act] for operating a motor vehicle with any amount of 11-carboxy-THC in his or her system."

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