Michigan Compiled Laws, Chapter 256. Motor Vehicles § 256.544

Sec. 4. The owner or keeper of any such garage or other establishment may provide blank forms upon which a description of the condition of any motor vehicle when so left in his care, may be noted; and when so provided and properly filled out in duplicate, he may require the owner of such motor vehicle to sign the same before leaving such vehicle. And if such a signed description is made, the owner or keeper of the garage or other establishment shall deliver a copy thereof to the owner of the vehicle. Refusal by the owner of such vehicle to sign such form shall be a bar to recovery under this act.