Sports

Using replay in sports to verify a call is a hot subject with many pros and cons including what to do if a mistake is found.  
The biggest issue in all sports that have replay is the time it takes to view the film and either verify or correct the call.  
Hockey, believe it or not, has the best system and the fastest.  
Hockey has an independent person or persons in a film room somewhere in Canada with all games being played on video screens around the room.