Mich. Comp. Laws § 286.83

Sec. 3. For the purpose of this act the commissioner of agriculture or his authorized agents shall have free access to any farm, field, orchard, garden, elevator, canning factory, warehouse, freight or express office, car, freight yard, vehicle, vessel, boat, container or any other place which for probable cause it may be necessary or desirable for such authorized agents to enter in carrying out the provisions of this act. It shall be unlawful to deny such access to such authorized agents and to hinder, thwart or defeat such inspection or entrance by misrepresentation or concealment of facts or conditions or otherwise.