I worked a Pro Am game today. One of the players will be on a D3 coaching staff this season. Last week he was setting questionable rolling screens. Today, before the game, I went up to him and said, "I hope you aren't going to teach your big men that illegal screen this year." He laughed and said "oh, you caught that. It won't be a problem today."
Guess what, he didn't come close to doing today. Preventive officiating is a good thing.