Mich. Comp. Laws § 18.1285

Sec. 285. (1) The head of each state agency shall maintain records which are necessary for all of the following: (a) The continued effective operation of the state agency. (b) An adequate and proper recording of the activities of the state agency. (c) The protection of the legal rights of the state. (2) The head of a state agency maintaining any record shall cause the records to be listed on a retention and disposal schedule. (3) Legal custody and physical possession of a record shall be vested in the state agency that created, received, or maintains the record until such time as it is transferred to the state archives or is destroyed.