and its rule change very slowly. sometimes wrong decisions by the referees have led to violence in stadiums. However, technology can help referees. starting at the world cup in 2014, FIFA agreed to install a goal control system using high speed cameras. If the ball crosses the goal line the referees receives confirmation in 0.3 second on a chronometer. in the future, referees may be able to use video replays to check fouls and off-side too.