The man who blew the lid on doping amongst Russian athletes

Hajo Seppelt's documentary "Top Secret Doping: How Russia Produces Its Winners", screened in Germany late last year - in it he interviewed champion Russian athletes who admited to doping, saying they were encouraged by officials. He also spoke with a Russian Anti-Doping Agency whistleblower who detailed the cover up of positive drugs tests. Hajo Seppelt's revelations prompted the World Anti-Doping Agency (WADA) to set up a commission to investigate, which has found a "deeply rooted culture of cheating" in Russian athletics - and accused it of 'sabotaging' the London 2012 Olympics by "covering-up, destroying and paying money to conceal doping tests". The commission also identified systemic failures in the International Association of Athletics Federations the IAAF.