The holding: Those who have a valid MMMA registry card cannot be prosecuted for having some THC in their system under MCL 257.625(8) – the zero-tolerance statute - because the MMMA provisions control; but they can be prosecuted under the MMMA if it can be shown that they were “under the influence”.
In Koon, the defendant was charged in the 86th District Court with operating a motor vehicle under the influence of THC. When stopped by the police, Koon told the officer that he had a medical marijuana registry card and admitted that he had smoked marijuana five to six hours earlier. THC was found in his bloodstream.
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