NCAA President Charlie Baker is urging states with legal wagering on sporting events to ban betting on individual player performances. Prop bets allow gamblers to wager on statistics a player will accumulate during a game. The NBA has opened an investigation into Toronto Raptors two-way player Jontay Porter amid gambling allegations related to his own performance in individual games. Ohio, Vermont and Maryland are among the states that have removed prop betting on college athletes.

Several states including Colorado, Arizona, Massachusetts, New York, Pennsylvania and Oregon have rules prohibiting prop betting on college athletes that predate the NCAA’s recent push. Others such as Illinois, Connecticut and Iowa do not allow college athlete prop bets involving in-state teams. The American Gaming Association estimates $2.7 billion will be bet this year on the NCAA men’s and women’s basketball tournaments through legal sportsbooks.