TV Announcers Blasting Officials

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Today during the Florida State-Virginia game, ESPN commentator Sean McDonough took the time to blast Jamie Luckie, saying that "he is one of those officials who finds a way to insert himself into the game" and referenced how many times Luckie goes to the monitor. McDonough has made his fair share of critical comments about certain officials over the years. It got me thinking, shouldn't there be a policy against commentators personally criticizing officials on air? I wouldn't think anyone would be okay with a commentator making personal comments about a coach or player on TV, so why is it acceptable to do so about an official?