Wis. Stat. § 944.36: Solicitation of drinks prohibited.

Any licensee, permittee or bartender of a retail alcohol beverage establishment covered by a license or permit issued under ch. 125 who permits an entertainer or employee to solicit a drink of any alcohol beverage, as defined in s. 125.02 (1), or any other drink from a customer on the premises, or any entertainer or employee who solicits such drinks from any customer, is guilty of a Class B misdemeanor.