Wis. Stat. § 51.82
A person alleged to be of unsound mind found in this state, who has fled from another state, in which at the time of the flight: (a) The person was under detention by law in a hospital, asylum or other institution for the insane as a person of unsound mind; or (b) the person had been theretofore determined by legal proceedings to be of unsound mind, the finding being unreversed and in full force and effect, and the control of his or her person having been acquired by a court of competent jurisdiction of the state from which the person fled; or (c) the person was subject to detention in that state, being then the person's legal domicile (personal service of process having been made) based on legal proceedings pending there to have the person declared of unsound mind, shall on demand of the executive authority of the state from which the person fled, be delivered for removal thereto.
Wis. Stat. § 51.82