Michigan v. Koon (Opinion on Application)
Annotate this CaseDefendant Rodney Lee Koon was stopped for speeding. During the stop, defendant voluntarily produced a marijuana pipe and informed the arresting officer that he was a registered patient under the MMMA and was permitted to possess marijuana. A blood test to which defendant voluntarily submitted several hours later revealed that his blood had a THC content of 10 ng/ml. The State charged defendant with operating a motor vehicle with the presence of a schedule 1 controlled substance in his body under MCL 257.625(8). The prosecution sought a jury instruction that the presence of marijuana in defendant's system resulted in a per se violation of the Michigan Vehicle Code. Defendant argued that the zero-tolerance provision could not possibly apply to MMMA registered patients because the MMMA prevented the prosecution of registered patients for the medical use of marijuana, including internal possession, and only withdraws its protection when the patient drives while "under the influence" of marijuana. Moreover, the MMMA resolved conflicts between all other acts and the MMMA by exempting the medical use of marijuana from the application of any inconsistent act. The district court and circuit court agreed with defendant. The Court of Appeals reversed, reasoning that the MMMA yielded to the Legislature's determination in MCL 257.625(8) that it is unsafe for a person to drive with any marijuana in his or her system. The issue before the Supreme Court centered on whether the MMMA's protection superseded the Michigan Vehicle Code's prohibition and allowed a registered patient to drive when he or she has indications of marijuana in his or her system but is not otherwise under the influence of marijuana. The Court concluded that it did. Accordingly, the Court reversed the Court of Appeals, reinstated the judgment of the Circuit Court, and remanded this case to the District Court for further proceedings.
Some case metadata and case summaries were written with the help of AI, which can produce inaccuracies. You should read the full case before relying on it for legal research purposes.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.