Wis. Stat. § 946.45: Negligently allowing escape.

(1) Any officer or employee of an institution where prisoners are detained who, through his or her neglect of duty, allows a prisoner in his or her custody to escape is guilty of a Class B misdemeanor.

(2) In this section:

(a) “Custody” has the meaning designated in s. 946.42 (1) (a).

(b) “Escape” has the meaning designated in s. 946.42 (1) (b).

(c) “Institution” includes a juvenile correctional facility, as defined in s. 938.02 (10p), a secured residential care center for children and youth, as defined in s. 938.02 (15g), and a Type 2 residential care center for children and youth, as defined in s. 938.02 (19r).

(d) “Prisoner” includes a person who is under the supervision of the department of corrections under s. 938.34 (4h), who is placed in a juvenile correctional facility or a secured residential care center for children and youth under s. 938.183, 938.34 (4m) or 938.357 (4) or (5) (e), or who is placed in a Type 2 residential care center for children and youth under s. 938.34 (4d).