Law 24 NO BALL
1. The umpire is required to ascertain the bowlers method of delivery at the start of each spell of bowling and inform the striker. It is unfair if a bowler changes his mode of delivery, without notifying the umpire. "No Ball" must be called and signalled.
2. The definition of a fair delivery in respect of the bowlers arm must be clearly understood. Once the bowlers arm has reached the level of the shoulder in the delivery swing, the elbow joint must not be straightened either partially or completely from that point until the ball has left the hand. This does not debar a bowler from flexing or rotating the wrist in the delivery swing. It does not preclude the bowler from bowling with a bent arm provided it remains bent throughout the delivery swing to same degree.
3. The action by the umpire if a delivery is thrown of caution, final warning and action to remove the bowler from the bowling attack shall be applied.
4. If the umpire at the bowlers end is not satisfied that, in the delivery stride (a) the bowlers back foot lands within and not touching the return crease and also that (b) the bowlers front foot lands with some part of the foot, whether grounded or raised, behind the popping crease - he shall call and signal " No Ball".
5.If the umpire considers that a ball which has been delivered, without having touched the strikers bat or person, and it either (a) bounces more than twice or (b) rolls along the ground before it reaches the popping crease, he shall call and signal "No Ball".
6. If a delivery comes to rest in front of the line of the strikers wicket, without having been touched by the strikers bat or person, the umpire shall call and signal "No Ball", immediately followed by the call and signal of "Dead Ball".
7. The umpire must immediately revoke the call of "No Ball" if, for any reason, the ball does not leave the bowlers hand.
8. The call of " No Ball" will always over-ride the call of "Wide Ball".
9. The ball does not become dead on the call of "No Ball".
10. The penalty of one run for a "No Ball" is awarded instantly. Unless it is revoked, it shall stand even if a batsman is dismissed and shall be added to any other runs scored or penalties awarded.
11. Law 40(The Wicket-keeper), Law 41(The Fielder) and Law 42(Unfair Play) detail offences resulting in the call and signal of "No Ball".
12. The one run penalty is scored as a "No Ball" extra. Any runs completed by the batsmen shall be credited to the striker if the ball has been struck by the bat. All runs resulting from a "No Ball", other than penalty, shall be debited against the bowler.
13. A "No Ball" does not count as a ball in the over.
14. The striker can be out from a delivery which is a "No Ball", under Law 34 (Hit the Ball Twice)
15.
Either batsman can be out from a delivery which is a "No Ball", under
Law 33 (handled the Ball), Law 37 (Obstructing the Field) or Law 38 (Run Out).