Wis. Stat. § 346.923: Human service vehicles; minimum operator qualifications.

Notwithstanding ss. 111.321, 111.322, and 111.335, no person may operate a human service vehicle transporting any passenger unless all of the following apply:

(1) The operator possesses a valid operator’s license issued under ch. 343 or by another jurisdiction that authorizes the operation of the human service vehicle.

(6) The operator holds a valid school bus endorsement under s. 343.12 or the operator meets the requirements specified under s. 343.12 (7) and (8) and any rule established by the department under s. 343.12 (7) and (8).

(8) The operator has, within the 2 previous years, been fully trained in the proper use of all passenger restraint systems available in the human service vehicle.