Mich. Comp. Laws § 409.118

Sec. 18. This act does not apply to or prohibit the employment of a student minor 14 years of age or older by an employer if a written agreement or contract is entered into between the employer and the governing body of the school district, public school academy, or nonpublic school at which the minor is enrolled. The employment shall not be in violation of a federal statute or regulation and a signed copy of the agreement shall be on file in the place of employment before the minor begins employment.