Wisconsin - Firearms/Weapons on School Campuses: Prohibitions or Restrictions
Wisconsin Statutes 120.13 School board powers
(bm) The school district administrator or any principal or teacher designated by the school district administrator shall suspend a pupil under par. (b) if the school district administrator, principal or teacher determines that the pupil, while at school or while under the supervision of a school authority, possessed a firearm, as defined in 18 USC 921 (a) (3). This paragraph does not apply to the possession of a firearm while legally hunting in a school forest if allowed under s. 120.13 (38).