So far, only one Premier League player has ever failed a test for using performance-enhancing drugs in a league match. According to a statement of one of UK Sport's Independent Sampling Officers (ISO), "If a club knows in advance we're coming, and the club suspects one of their players, they keep him off training and his name doesn't appear on the list I am given." In the 1999–2000 season, testers were present at just 32 of the over 3,500 league matches, taking samples from two players of each side.