Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.1348

Sec. 1348. (1) An employer or the employer's agent, who threatens to discharge or discipline or who discharges, disciplines, or causes to be discharged from employment or to be disciplined a person because that person is summoned for jury duty, serves on a jury, or has served on a jury, is guilty of a misdemeanor, and may also be punished for contempt of court.

(2) An employer or the employer's agent who requires a person having jury duty to work any number of hours during a day which, if added to the number of hours which the person spends on jury duty during that day, exceeds the number of hours normally and customarily worked by the person during a day, or the number of hours normally and customarily worked by the person during a day which extends beyond the normal and customary quitting time of that person unless voluntarily agreed to by that person, or as provided in a collective bargaining agreement is guilty of a misdemeanor, and may also be punished for contempt of court.