Wis. Stat. § 23.61: Search and seizure; when authorized.

A search of a person, object or place may be made and things may be seized when the search is made:

(1) Incident to a lawful arrest;

(2) With consent;

(3) Pursuant to a valid search warrant;

(4) With the authority and within the scope of a right of lawful inspection;

(5) Incident to the issuance of a lawfully issued citation under s. 23.60;

(6) During an authorized temporary questioning under s. 23.59; or

(7) As otherwise authorized by law.