There was a girl who shot her FIRST 300 with a Jackal a couple nights ago because the other pro shop in town told her it was ok to use. Now, our association heads won't accept/process the paperwork with that ball on it, and they also won't accept paperwork with a different ball marked down, everyone has been informed. She just kinda got screwed.
Now does it really matter? No, ball is illegal because it's illegal, not because there's any reason for that rule being there in the first place, but illegal is still illegal whether there's a good reason for it or not, and telling people not to throw the ball is protection for THEM, not because people think they're cheating by using them. This girl will likely never throw 300 again, and for her only one, she's not going to get anything. Mostly because USBC is stupid and that rule is pointless, but I digress . .