Touch judges also stand behind the posts to confirm that a goal has been scored following a penalty kick or conversion of a try.
In rugby league, touch judges can communicate with the referee verbally or through a number of specific flag and hand signals.
These indicate specific breaches of the laws, for example forward pass, knock on and penalty offences, how play should restart and whether the ball was grounded correctly for a try.
As in rugby union, touch judges stand behind the posts to confirm success of a penalty kick or the conversion of a try.
Touch judge and referee signals and duties in rugby league are laid out in the laws of the game.