Not if NFL games are prearranged.
They don't want players gambling on their own and screwing up results that are already on a list locked in the Commissioner's desk.
We'll know by now. And it'll be a major scandal.
Most likely scenario?
A couple of referees and players are gambling on their own. They're trying to be "discreet" about it. But we notice it anyway because of blown calls and bad plays during a game.