If they are timing the players, why not the ref? 

VAR and TMO in sport are good things. They back up referees with evidence, cut out errors, and—largely—make sure the right side wins for the right reasons. They’ve also taken some of the heat off officials, curbed a few theatrical collapses, and opened the door to genuine transparency for fans. In short, they’ve made sport fairer, sharper, and a lot harder to cheat. 

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