International sport was largely dominated by communist East Germany in the 1970s and 80s. But it has since transpired that the state systematically doped its athletes and their success was a sham.Many former trainers have consistently denied any wrongdoing,even though scores of athletes have been left with serious health problems. But now,twenty years after the fall of the Berlin Wall,a group of former trainers have admitted their guilt - and got off scott-free. They all currently coach Germany's top track-and-field stars,and they've been told their jobs are safe,despite their confession.