On the eve of the Summer Olympics in Rio, Russia claims 270 of its athletes have been cleared for competition. For the man who helped expose Russia's state-sponsored doping, that's a source of frustration. Jack Robertson, former investigator for the World Anti-Doping Agency, says WADA repeatedly thwarted his efforts to clean up the Games. He was interviewed extensively by David Epstein of the investigative news group ProPublica.
KCRW
