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: Should Arsenal's penalty against West Ham United have been canceled? What happened with Sunderland's overturned spot kick at Manchester United? And why didn't Alexander Isak win a penalty for Liverpool at Chelsea?