Rule 5 – Fouls
5a. Definition
A foul occurs when a part of the player’s body encroaches on or goes beyond the foul line and touches any part of the lane, equipment or building during or after a delivery. A ball is in play after a delivery until the same or another player is on the approach in position to make a succeeding delivery.
The certification and inspection committee of a local association can require that the foul line be plainly marked on the walls, posts, division boards or any other structure in a bowling center on a line with the regular foul line.
When a foul is recorded the delivery counts, but the player is not credited with any pins knocked down by that delivery. (See Rule 6b.)
NOTE:
The foul line is of infinite length including walls, floors, posts and ball returns. A foul is not committed when foreign objects such as pens, jewelry, coins, cigarettes, etc., drop from a bowler’s pocket or fall from a person’s body or clothing. (Footwear and clothing are considered part of the body.) A player should request permission to cross the foul line to retrieve any items that have fallen beyond the foul line.