Mich. Comp. Laws § 722.690

Sec. 20. A person who possesses managerial responsibility for a business enterprise renting or selling ultra-violent explicit video games that are harmful to minors shall not knowingly permit a minor who is not accompanied by a parent or guardian to play or view the playing of an ultra-violent explicit video game that is harmful to minors. A person who violates this section is guilty of a misdemeanor punishable by imprisonment for not more than 93 days or a fine of not more than $25,000.00, or both.