Mich. Comp. Laws § 287.894

Sec. 4. (1) The director may require that a ferret be identified pursuant to Act No. 309 of the Public Acts of 1939, being sections 287.301 to 287.308 of the Michigan Compiled Laws, at the expense of the owner. (2) An owner shall prevent a ferret from leaving the owner's property unless the ferret is confined or leashed and under the direct control of the owner or a responsible person designated by the owner. (3) A person shall not release a ferret into the wild or abandon a ferret.