Law 42.6:
a) Any delivery, which passes or would have passed on the full above waist height of the striker standing upright at the popping crease is deemed unfair, whether or not it is likely to inflict physical injury on the striker.
b) In the event of a bowler bowling a high full pitched ball as defined in Clause 42.6.2 (a) above, the umpire at the bowler’s end shall call and signal no ball. If, in the opinion of the umpire, such a delivery is considered likely to inflict physical injury on the batsman, the umpire at the bowler’s end shall, in addition to calling and signalling no ball, when the ball is dead, caution the bowler and issue a first and final warning. The umpire shall inform the other umpire, the captain of the fielding side and the batsmen at the wicket of what has occurred.
c) Should there be any further instance (where a high full pitched ball is bowled and is considered likely to inflict physical injury on the batsman) by the same bowler in that innings, the umpire shall in addition to calling and signalling no ball, when the ball is dead, direct the captain to take the bowler off forthwith. If necessary, the over shall be completed by another bowler, who shall neither have bowled the previous over, or part thereof, nor be allowed to bowl the next over, or part thereof.
d) The bowler thus taken off shall not be allowed to bowl again in that innings.