I had a guy in a small league I bowl in, use his spare ball for the first 6 weeks (strikes and spares). Was averaging about 165, when he normally averages around 210-215. I personally took it up in a league meeting to have him removed. Long story short, the league vote was barely 50-50, when a 2/3rds majority was needed. Everyone told me that they knew he was cheating, but the league apparently thought the penalty of kicking him out of the league was too harsh. Just a microcosm of the problem.