Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.2421

Sec. 2421. (1) Except as provided in sections 2421a to 2421d  1 and as otherwise provided by law, in all civil actions by or in the name of the people of this state, except civil infraction actions, instituted by an officer duly authorized for that purpose and not for the use of a citizen, the state shall be liable for costs in the same manner and to the same extent as if the action were commenced by an individual.

(2) In all civil actions instituted in the name of the people of this state, on the relation of any citizen, the relator shall be entitled to and liable for costs as if the action had been commenced in the relator's own name.

(3) When costs are adjudged against the people of this state in a civil action or proceeding, instituted by an officer duly authorized for that purpose, the state treasurer shall issue a warrant for the amount thereof, upon the production of an authenticated copy of the record of judgment, or of the order adjudging the costs, with a taxed bill thereof, and upon the certificate of the attorney general that the action or proceeding was duly instituted, as by law required.