Wis. Stat. § 457.24: Professional liability insurance.

(1) Except as provided in sub. (2), a clinical social worker, marriage and family therapist, or professional counselor may not practice clinical social work, marriage and family therapy, or professional counseling unless he or she has in effect professional liability insurance. The examining board shall promulgate rules establishing the minimum amount of insurance required under this subsection.

(2) Subsection (1) does not apply to a person practicing clinical social work, marriage and family therapy, or professional counseling as an employee of a federal, state, or local governmental agency, if the practice is part of the duties for which he or she is employed and is solely within the confines of or under the jurisdiction of the agency by which he or she is employed.