Illinois is banning certain types of betting on NFL games, at the league’s request, out of concern that some bets are easy to manipulate by a single person.

The Illinois Gaming Board has taken action in response to a request from the NFLaccording to the Chicago Tribune.

Among the bets that have been banned are first plays, results of replays, whether a kicker will miss a field goal or an extra point, and whether a quarterback’s first pass of a game will be incomplete. Outside of the game, betting has also been banned on anything relating to fan safety, player misconduct, penalties, referee assignments and roster or personnel decisions.

The rule aims to prohibit anything that could be considered “100% determinable by a single person in a single piece.”

“Predetermined choices and actions under the control of individual players, coaches or league officials are susceptible to abuse and manipulation,” wrote Gaming Board administrator Marcus Fruchter.

This is part of the strange new world of sports betting, where the league itself is concerned enough about the possibility of game manipulation to ask gaming companies not to allow such bets. Theoretically, sportsbooks shouldn’t want to accept these bets anyway, because if someone is manipulating the game, they are doing it to scam the sportsbooks. But the league doesn’t even want that to be possible, or for there to be the perception that someone involved with a team or the league might have had a financial interest in the outcome.

Illinois sportsbooks have been warned that their licenses could be revoked if they accept such bets.