R 432.21321 Calling.

Rule 321. (1) Balls shall be drawn from a bingo receptacle or selected using a random number generator, displayed, and clearly announced. (2) Each ball shall be displayed so that 2 or more players can see the number or symbol on the ball before it is called. A video monitor may be used to display the balls, if a random number generator is used. (3) If balls are drawn from a bingo receptacle, then the following provisions apply: (a) The caller shall be located so that 2 or more players can observe the drawing of the ball from the bingo receptacle. (b) Each ball drawn shall be placed in the master board. (c) Only 1 person shall handle the balls. (d) There shall be not more than 1 ball drawn from the bingo receptacle at 1 time. (e) Once removed, balls shall not be returned to the bingo receptacle until the conclusion of the game. (f) A ball shall not be physically pushed back down into the machine. (g) A hand or other object shall not be placed over the opening of the bingo receptacle while the game is in progress. (4) If more than 1 room or area is used for any 1 bingo occasion, then all of the following provisions apply: (a) If a method to display balls is used in1 of the rooms, then an equivalent method shall be used in each of the rooms. (b) All called numbers or symbols shall be clearly audible to the players in all of the rooms or areas. (c) A worker shall be present at all times in each room or area while a game is in progress.