Wis. Admin. Code Department of Administration [Gaming] Game 42.13
Before beginning any bingo occasion, the caller shall make sure that all equipment is in good working order by inspecting the equipment, with particular attention to the blowers, receptacles, trays and passages within the equipment through which the numbered objects must travel. The caller shall also make sure that each of the numbered objects to be used in calling the numbers for the bingo occasion is in good condition and is clean and dry to sight and touch. The caller shall also make sure that all 75 numbered objects to be drawn are in the receptacle, and that there are no omissions or duplications in the numerical order of the numbered objects. The inspections required under this section shall be witnessed and verified by at least 2 players who have paid admission to the occasion.
Wis. Admin. Code Department of Administration [Gaming] Game 42.13