California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 24107

Every operator of an auction yard or dealer who handles animals destined for slaughter shall keep a written record of all sales and purchases made in the course of conducting the business for at least two years after making the final entry of any purchase, sale, or donation of an animal. The operator of an auction yard or the dealer shall show the record on demand to any investigator of the program or any peace officer.