Mich. Comp. Laws § 324.52902: Transportation of plants.

Sec. 52902.

A person shall not transport within this state any plant in either of the following circumstances:

If the plant has been removed from property owned by the person, unless he or she has in possession a current tax receipt or deed with respect to the property or a copy of the receipt or deed.

If the plant has been removed from property not owned by the person, unless either of the following has been met:

Each plant bears a tag placed on the plant by and identifying the person and his or her address and stating from whom the plant was acquired.

The person has in his or her possession a bill of sale or other evidence of title acquisition in a form prescribed by and available from the department or the department of agriculture or the federal agency that has jurisdiction. The person shall display the bill of sale or other evidence of title upon demand of a law enforcement officer.