god find, so it appears there really isn't a rule in place...or at least not a clearly defined one. The rule your thinking of Vance could very well be the College rule. Venditte is from Creighton and I am a Nebraska Cornhusker baseball fan. It occured last year. We had a switch hitter up and Venditted got on the mound to pitch right handed. So Nebraska's batter got into the left hand batters box. Venditte attempted to switch to his left hand to pitch and the Umpire said NOT SO FAST MY FRIEND. And he was forced to pitched right handed. The funny thing was a day before the game Creighton's head coach said he knew the rule in place and that it could come into play and Venditte would just have to deal with it. Well when the umpire wouldn't let Venditte switch creighton head coach Ed Servais decided to go argue.... thought it was funny that he knew the rule yet he felt he needed to argue anyways probably because he hates losing to Nebraska so much.