Mich. Comp. Laws § 445.304: Blanks for record; custody, inspection.

Sec. 4.

All such blanks when filled shall constitute a record of the purchase or purchases made; shall be safely kept by such purchasers for a period of 1 year and shall at all times be open to the inspection of all sheriffs, their deputies, police officers, or other law enforcement officers of this state upon demand by such officer.