S.D. Codified Laws § 41-14-23
Each fur dealer licensee, licensed pursuant to the provisions of § 41-6-25, shall keep a permanent record of each purchase made. The purchase record shall show the kind of each skin purchased, the date and place of each purchase, the full name and address of the vendor, and the price paid. The record shall also contain copies of all invoices of sales made by the licensee. Each invoice shall disclose the kind of each skin sold, date and place of sale, the name and address of the purchaser, and the place and mode of shipment and delivery. The record is subject to inspection at all times by the secretary of game, fish and parks or any conservation officer or law enforcement officer. A violation of the provisions of this section by a licensee is a Class 2 misdemeanor.
SDCL 41-14-23