The R & A has suggested that golf courses add a local rule to deal with a golf ball moving on the green, and this has now been incorporated at Monifieth. There was some controversy at the 2016 US Open when Dustin Johnson’s ball moved, and the rule making bodies have sought to clarify the rule, and make it fairer. The additional rule is now incorporated into our local rules and reads as follows.
“When a player’s ball lies on the putting green, there is no penalty if the ball or ball marker is accidentally moved by the player, his partner, his opponent, or any of their caddies or equipment. The moved ball or ball marker must be replaced.”
Note: This local rule only applies when the player’s ball or ball marker lies on the putting green and any movement is accidental; if a player’s ball on the putting green is moved as a result of wind, water or some other natural cause such as the effects of gravity, the ball must be played as it lies from its new location; a ball marker moved in such circumstances is replaced.