LS John, to touch a ball either prior or after the cue ball is contacted is not a foul under WPA or BCAPL Cue Ball Foul Only rules, unless the disturbed object ball has an effect upon the shot. For instance; I am shooting over a ball and contact it, rolling it forward, now I drew the cb backwards into the ob, or into an area the ob would have been in if not moved, this is a foul. By memory, I believe bcapl has a diagram of this scenario in their AR's. under Disturbed Balls 1.33.
But a director of a tournament could make it a rule that if you contact a ball when shooting over a ball and you proceed to contact the cb it is a foul, but it would be ill advised in todays Cue Ball Foul Only rules.
Hustler's Way: Butch the owner of the Palace explained to me that this is how we play for money, and he said; "If you move a ball it is not a foul as long as you do not continue to contact the cb, but if you do contact the cb it is then a foul". In other words you have to give the opponent a chance to move the ob back or not, otherwise it is a foul. I always played the hustler's way, after that. It is always good practice that if you know you have disturbed a ball then stop and acknowledge it, for otherwise the shot may result in a foul if the disturbed ball inadvertently has an effect upon the shot.
We played our local weekly league at one time by "all ball fouls", and each game was watched by the other team's captain. The problem was they would get so close to the table, and then get right down there on eye level to see if a ball was touched or not, that it just made it unbearably annoying. And a lot of times a foul was called and the player honestly and truly never even realized they touch a ball, and yes they did foul, but it is hard to accept when you do not even realize it.
So now we play that if a ball is touched and there is absolutely no effect upon the shot whatsoever then it is not a foul. Whitey