Wis. Stat. § 302.025: Service of process on prison officers, employees, or inmates.

(1) Service of process may be made on the warden or superintendent of any prison named in s. 302.01 as upon any other resident of this state.

(2) Except as provided in sub. (1), service of process within any prison under s. 302.01 on any officer, employee, or inmate of the prison shall be made by the warden or superintendent or some person appointed by the warden or superintendent to serve process.