Taking power away from the referees

Referees will still have to make a good judgement in the game. For instance, if they award a penalty for what later turns out to be a dive, the resulting goal and course of the game will still stand. It is still essential that the result of the game is as fair as possible. This new rule would just allow for punishment for diving players if it is found that a dive had occurred that had not been spotted in the game.

By punishing players after the match is over, you are discouraging refs from taking important decisions during games. If they are not 100% sure that there was a dive, referees will not take action at the time because they know it can just be verified afterwards.