CARO (AP) -- The Michigan appeals court says the state's medical marijuana law can't be used retroactively to save people from drug charges.
The court reversed a decision by a Tuscola County judge, who had dismissed charges against a man caught with nine plants and drug paraphernalia. Keith Campbell says he was using marijuana for medicinal purposes.
But the bust occurred in 2007, a year before the marijuana law took effect.
The appeals court said Wednesday there are defenses to possessing pot if the drug is used to ease illness. But the court notes there's nothing in the law allowing it to be applied retroactively.
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