Michigan Compiled Laws, Chapter 37. Civil Rights § 37.2202a

Sec. 202a. (1) An employer shall do both of the following if that employer lists racial or ethnic classifications in a writing developed or printed 90 or more days after the effective date of this section, and if that employer requests that an individual select a classification to designate his or her race or ethnicity:

(2) If a federal agency requires an employer to transmit information obtained from an individual pursuant to a writing described in subsection (1), but rejects the classification “multiracial”, the employer shall redesignate the individuals identified as multiracial by allocating those individuals to racial or ethnic classifications approved by the federal agency in the same ratio that those classifications occur within the general population of the group from which the information was solicited.

(3) As used in this section, “writing” means that term as defined in section 2 of the freedom of information act, Act No. 442 of the Public Acts of 1976, being section 15.232 of the Michigan Compiled Laws.