Originally Posted by pete's montreux
All a player has to do is sprint off the bench, set a screen for someone, catch an alley oop, and score a basket. All it would be is a technical free throw for the other team. You don't have to sneak in. That's the problem with the rule.
It wouldn't be just a technical, they would take away the basket. It's only if the play restarts and the other team inbounds the ball and the play goes on, and THEN they figure out what happened that you cannot take the basket away.
Once the play restarts, you cannot change decisions. That goes for every rule, not just the one about how many players are allowed on the court at once.