S.D. Codified Laws § 35-9-2.2
Current with legislation signed by the governor on or before 3/6/2024
If a merchant chooses to implement the provisions of § 35-9-2.1, the merchant shall conspicuously post a notice, on the merchant's premises, stating that any person who the merchant reasonably believes was under the age of twenty-one and has attempted to purchase alcoholic beverages, will be detained and surrendered to a law enforcement officer.
SDCL 35-9-2.2