Two or more counties, cities, villages, or townships, whether adjacent to each other or not, may enter into agreements to provide mutual police assistance to one another in case of emergencies.

     The agreements, subject to the approval of the governing bodies of the counties, cities, villages, or townships, shall provide for the nature of the emergency, who shall declare the emergency, under what circumstances police assistance may be asked for, and by which county, city, village, or township officials; and shall provide for the payment of the services and what powers, duties, and responsibilities, and under whose authority, policemen called to duty under the terms of the mutual aid assistance agreement shall serve.

     The agreements shall contain provisions relative to compensation and disability payments, retirement and furlough payments and charges to be made for equipment, supplies and materials used or expended while rendering assistance under the agreement.

     Two or more counties, cities, villages, or townships adjacent to each other may join together, by contract or by the establishment of an intermunicipal police authority, for the purposes of providing police services to the respective counties, cities, villages, and townships. The contracts or intermunicipal police authorities shall be approved by the governing bodies of the counties, cities, villages, and townships; shall be administered by a commission established in accordance with the agreements; and shall contain provisions relative to apportionment of the costs of the services among the counties, cities, villages, or townships making the agreements.