A search of a person, object or place may be made and things may be seized when the search is made:
Wis. Stat. § 23.61
The warrantless search of a fisherman's truck by state conservation wardens under s. 29.33(6) [now s. 29.519(6)] was presumptively reasonable. State v. Erickson, 101 Wis. 2d 224, 303 N.W.2d 850 (Ct. App. 1981).