The NFL has the challenge flag, in the NHL and the NBA the referee has the ability to review important plays, and more recently in the MLB they are now allowing coach’s to challenge a ruling. Now the MLS will be eventually implementing there own form of video review during games to aid the refs decision on important plays.
The MLS will be one of six leagues to test out FIFA’s new Video Assistant Referee Project. What this will do is give referees a chance to review four types of plays during the game: goals, penalty decisions, direct red card incidents, and mistaken identity.