Mich. Comp. Laws § 730.517

Sec. 17. In any city affected by the provisions of this act, it shall be the duty of the judge presiding in all jury trials to instruct the jury as to the law applicable to the case, which instructions shall be received by the jury as the law of such case. Either party may present written requests to charge to the judge, who shall present all of such requests to the jury as he shall deem to correctly state the law applicable to the case.