OBR 2.00:
A FOUL BALL is a batted ball that settles on foul territory between home and first
base, or between home and third base, or that bounds past first or third base on or over foul
territory, or that first falls on foul territory beyond first or third base, or that, while on or
over foul territory, touches the person of an umpire or player, or any object foreign to the
natural ground