39-31-211. Labor organizations representing employees of the board to be unaffiliated. A labor organization representing employees of the board may not affiliate or associate itself with a labor organization that represents any employees other than employees of the board. The board may not certify a labor organization as the exclusive representative of the employees of the board if, at the time of certification or thereafter, the labor organization is associated or affiliated with a labor organization that represents employees other than employees of the board.