Video Assistant Referee (VAR) technology is once again in the spotlight after a farcical night at Wembley as Tottenham played Rochdale in a FA Cup replay.
Referee Paul Tierney disallowed a first-half goal scored by Tottenham's Erik Lamela with a mystifying VAR call and then ruled out a Son Heung-min penalty due to 'illegal feinting'.
It wasn't the first time the VAR has left fans, players, coaches and television viewers utterly bemused, and Tottenham manager Mauricio Pochettino has said it will 'kill emotion in football.'
We take a closer look at what all the fuss is about and what can be done to improve a currently flawed system.