the goalkeeper may guard the goals. It must be taken by lifting and striking and the sliotar must be struck on or behind the 20m line (The penalty rule was amended in 2015 due to safety concerns. Before this the ball merely had to start at the 20m line but could be struck beyond it. To balance this advantage the two additional defenders previously allowed on the line have been removed). If many players are struggling for the ball and no side is able to capitalize or gain control of it the referee may choose to throw the ball in between two opposing players. This is also known as a "throw in". Officials A hurling match is watched over by eight officials: The referee (on field) Two linesmen (sideline) Sideline official/standby linesman (inter-county games only) Four umpires (two at each end) Hawkeye Video technology for some scoring situations in Croke Park and Semple Stadium (inter-county games only) The referee is responsible for starting and stopping play, recording the score, awarding frees, noting infractions, and issuing yellow (caution) and red (order off) penalty cards to players after offences. A second yellow card at the same game leads to a red card, and therefore to a dismissal. Linesmen are responsible for indicating the direction of line balls to the referee and also for conferring with the referee. The fourth official is responsible for overseeing substitutions, and also indicating the amount of stoppage time (signalled to him by the referee) and the players substituted using an electronic board. The umpires are responsible for judging the scoring. They indicate to the referee whether a shot was: wide (spread both arms), a 65 m puck (raise one arm), a point (wave white flag), or a goal (wave green flag). Contrary to popular belief within the association, all officials are not obliged to indicate "any misdemeanours" to the referee, but are in fact permitted to inform the referee only of violent conduct they have witnessed which has occurred without the referee's knowledge. A linesman or umpire is not permitted to inform the referee of technical fouls such as a "third time in the hand", where a player catches the ball for a third time in succession after soloing or an illegal pick up of the ball. Such decisions can only be made at the discretion of the referee. Injury risk Blunt injury to the larynx is