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: Why did Southampton have a goal ruled out for offside at Brighton & Hove Albion, and why did the check take so long? Plus, should Arsenal's opening goal at West Ham United have been disallowed?