Michigan Compiled Laws, Chapter 408. Labor § 408.1014m

Sec. 14m. The standard incorporated by reference in section 14a  1 and sections 14b to 14l 2 occupy the entire field of regulation of occupational safety and health with respect to hazardous chemicals in the workplace. Except as specifically provided in this act, any provision of any ordinance, law, rule, regulation, policy, or practice of a city, township, village, county, governmental authority created by statute, or other political subdivision of the state that imposes any requirement on an employer or expands the rights of an employee with respect to the communication of the hazards of hazardous chemicals in the workplace shall be considered in conflict with this act and shall not be enforceable.