Mich. Comp. Laws § 333.27952
The purpose of this act is to make marihuana legal under state and local law for adults 21 years of age or older, to make industrial hemp legal under state and local law, and to control the commercial production and distribution of marihuana under a system that licenses, regulates, and taxes the businesses involved. The intent is to prevent arrest and penalty for personal possession and cultivation of marihuana by adults 21 years of age or older; remove the commercial production and distribution of marihuana from the illicit market; prevent revenue generated from commerce in marihuana from going to criminal enterprises or gangs; prevent the distribution of marihuana to persons under 21 years of age; prevent the diversion of marihuana to illicit markets; ensure the safety of marihuana and marihuana-infused products; and ensure security of marihuana establishments. To the fullest extent possible, this act shall be interpreted in accordance with the purpose and intent set forth in this section.
MCL 333.27952