https://www.newscientist.com/article/mg23831820-600-why-video-assisted-referees-wont-stop-world-cup-errors/

As the 2018 World Cup kicks off in Russia, football fans across the globe are eagerly sizing up their team’s chances. Will it be Germany again? Or dark horse Belgium? Or will the trophy go outside Europe for the first time since 2002?

This year, fans will have someone new to blame when things go wrong: the video referee. For the first time in the World Cup, decisions in all 64 games of the tournament will be subject to review by a team of off-pitch officials watching video footage of the game. Referees are only human, and over the past decade or so we have learned how psychological tics can make decisions go awry. The aim of the new technology is to cut out these quirks of perception. Trouble is, it might end up just introducing new ones.