The match is controlled by the referee, who enforces the Laws of the Game, and the first referee is the only one who can legally abandon the match because of interference from outside the field. This referee is assisted by a second referee who typically watches over the goal lines or assists the primary referee with calls on fouls or plays. The decisions made by the referees are final and can only be changed if the referees think it is necessary and play has not restarted. There is also a third referee and a timekeeper who are provided with equipment to keep a record of fouls in the match. In the event of injury to the second referee, the third referee will replace the second referee.