The sports world is facing a massive potential doping scandal linking athletes from around the world with suspect blood tests.
According to Jonathan Calvert and George Arbuthnott of the Sunday Times and German broadcaster ARD/WRD (via Dan Roan of BBC Sport), leaked files from the International Association of Athletics Federations provided access to 5,000 athletes accounting for more than 12,000 blood tests.
The files leaked by a whistleblower were reviewed by Robin Parisotto and Michael Ashenden, whom the report calls two of the "foremost anti-doping experts," and reveal many "suspicious" drug tests.
The report also notes "there can be various reasons for abnormal blood samples other than performance enhancing drugs.