The global effort to prevent athletes using performance-enhancing drugs is vast and sophisticated. You might think, in this era of advanced testing, it would be almost impossible to cheat and get away with it. But is that really the case? Alberto Salazar, one of the world’s most successful coaches, has been accused of encouraging his athletes to dope. Salazar strongly denies the allegations. But the story has reignited concerns that, despite the efforts of the anti-doping authorities, cheating is still too easy in elite sport. The Inquiry hears from someone who sets the rules, someone who tests the rules and someone who broke the rules to find out if the dopers or the testers are winning. (Photo: The starting line of an athletics track. Credit: Ben Stansall/Getty Images)