8.3 Ball Pocketed

A ball is pocketed if it comes to rest in a pocket below the playing surface or enters the ball return system. A ball near the brink of a pocket partly supported by another ball is considered pocketed if removal of the supporting ball would cause the ball to fall into the pocket.
If a ball stops near the edge of a pocket, and remains apparently motionless for five seconds, it is not considered pocketed if it later falls into the pocket by itself. See 1.7 Balls Settling for other details. During that five second period, the referee should ensure that no other shot is taken. An object ball that rebounds from a pocket back onto the playing surface is not a pocketed ball. If the cue ball contacts an already pocketed ball, the cue ball will be considered pocketed whether it rebounds from the pocket or not. The referee will remove pocketed object balls from full or nearly full pockets, but it is the shooter’s responsibility to see that this duty is performed.