Mich. Comp. Laws § 3.890
Any participating jurisdiction rendering aid to another participating jurisdiction pursuant to this agreement shall, if requested, be reimbursed by the participating jurisdiction receiving that aid for any loss or damage to or expense incurred in the operation of any equipment and the provision of any service in answering a request for aid and for the costs incurred in connection with those requests. An aiding participating jurisdiction may assume in whole or in part any loss, damage, expense, or other cost or may loan equipment or donate services to the receiving participating jurisdiction without charge or cost. Any 2 or more participating jurisdictions may enter into supplementary agreements establishing a different allocation of costs among those participating jurisdictions. Benefits under Article VIII are not reimbursable under this section.
MCL 3.890