Michigan Compiled Laws, Chapter 408. Labor § 408.966

Sec. 6. (1) An employer or any other person shall not interfere with, restrain, or deny the exercise of, or the attempt to exercise, any right protected under this act.

(2) An employer shall not take retaliatory personnel action or discriminate against an employee because the employee has exercised a right protected under this act. Rights protected by this act include, but are not limited to, the right to use earned sick time under this act, the right to file a complaint or inform any person about any employer's alleged violation of this act, the right to cooperate with the department in the department's investigations of alleged violations of this act, and the right to inform any person of the person's rights under this act.

(3) An employer's absence control policy must not treat earned sick time taken under this act as an absence that may lead to or result in retaliatory personnel action.

(4) The protections in this section apply to any person that mistakenly but in good faith alleges a violation of this section.

(5) An employer may take adverse personnel action against an employee if the employee uses earned sick time for a purpose other than a purpose described in section 4,  1 or violates the notice requirements under this act.