Columbia Medical marijuana ordinance (§ 16-255.1)

A qualifying patient, or the primary caregiver of a qualifying patient, with a valid medical marijuana identification card from the Missouri Department of Health and Human Services, or its successor, shall be allowed to possess marijuana and marijuana paraphernalia in accordance with the provisions of Missouri laws and regulations. In any prosecution for such possession, it shall be an affirmative defense that the person possessed a valid medical marijuana identification card at the time of the offense.