Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.6440

Sec. 6440. No claimant may be permitted to file claim in said court against the state nor any department, commission, board, institution, arm or agency thereof who has an adequate remedy upon his claim in the federal courts, but it is not necessary in the complaint filed to allege that claimant has no such adequate remedy, but that fact may be put in issue by the answer or motion filed by the state or the department, commission, board, institution, arm or agency thereof.