Mich. Comp. Laws § 28.222

Sec. 2. The commissioner of public safety shall appoint the instructor or instructors of such school and may call upon members of any state department or any instructor or professor in any state educational institution, to act as instructor or lecturer in such school, and may pay the reasonable expenses of such person while in attendance. The legislative body of any county, township, city or village may authorize the attendance at such school of any law enforcing officer under the jurisdiction of such county, township, city or village, and may provide for the payment of the expenses of such person while in attendance which payment shall be made out of the general fund of such county, township, city or village.