Video Assistant Referee causes controversy every week in the Premier League, but how are decisions made, and are they correct?
After each weekend we take a look at the major incidents to examine and explain the process both in terms of VAR protocol and the Laws of the Game.
In this week's VAR Review: Was Arsenal midfielder Myles Lewis-Skelly's red card at Wolves as controversial as has been made out? Should Ipswich Town's Julio Enciso had been sent off at Liverpool? And how does Manchester United's Lisandro Martínez keep getting away with two-footed challenges?
Wolves 0-1 Arsenal
Possible red card overturn: Foul by Lewis-Skelly on Doherty
What happened: Arsenal won a corner in the 43rd minute. It was easily cleared high and away by the Wolverhampton Wanderers defence, but Matt Doherty picked up the loose ball on the edge of the box and looked to break forward. Myles Lewis-Skelly brought Doherty down, with referee Michael Oliver producing a red card for serious foul play. It was checked and cleared by the VAR, Darren England. (watch here)
VAR decision: Red card stands
VAR review: Some of the discourse around this red card has been ridiculous, even dubbed by one pundit as "the worst decision ever seen in Premier League football history." It's not even the worst this season (see the incorrect stoppage-time match-winning VAR penalty given to West Ham United against Manchester United).
With the over-the-top reaction, perhaps it's no surprise that Oliver and his family have been subjected to "threats and abuse." It's possible to criticise an outcome without resorting to either hyperbole or attacks on referees, because there are clear grounds for the VAR to intervene and downgrade to a yellow card.
This should be looked as a wider assessment of serious foul play. If PGMOL wants to get tough on challenges that have endangered the safety of an opponent, this seems like a low bar to go in on.
There have been many worse challenges, perceived or otherwise, that haven't resulted in a red card. Indeed, with the Premier League's desire to have a higher-intensity game, players are far more likely to stay on the pitch than be sent off. It's why this decision feels like such an outlier.
So what did Oliver see, and why did the VAR support him?