The penalty for a foul
★ Our fix The penalty for a foul follows where the cue ball ends up. ("The next player" always means the next surviving player in group order; only a failed break has its own penalty.)
The cue ball left the playing area — potted, or off the table. The next player takes the cue ball in hand and places it anywhere (only behind the head string after a scratch on the break). Knocking a numbered ball off the table is punished exactly the same — and the launched ball goes back on the foot spot.
The cue ball stayed on the table — no contact, first contact with one of your own balls, or nothing potted and no ball reaching a cushion after contact. The cue ball stays where it lies and the next player gets two shots.
The two shots work like this: the first shot is exempt from the legal-shot conditions — you may simply nudge the cue ball into a better spot, hitting and potting nothing, and it is not a foul. If your first shot legally pockets an opponent ball right away, you just keep shooting as normal — the second shot is forfeited, it does not carry over. All other fouls (a scratch, a ball knocked off the table, a double hit…) still apply to the first shot, and sinking your own ball ends your turn here too — either way you lose the second shot.
A foul never brings anyone's ball back out of a pocket — numbered balls potted on the fouling shot stay down. Pocketed balls return solely under the When you sink your own ball rule — and that rule applies even when the shot was also a foul.