The Sunday Times and the German broadcaster ARD/WDR have published a huge expose after being given access to a secret database detailing the results of more than 12,000 blood tests from 5,000 athletes.
The conclusion is stark: that more than a seventh of athletes, around 800 in total, have recorded results that according to an expert are “highly suggestive of doping or at the very least abnormal."
'I'll sue!': Top British athlete confronted over doping claims
Ten medals at the London 2012 games are said to have been won by athletes in the abnormal range, with Sunday's revelations revealing a sport in a "diabolical state" according to one expert, who drew parallels with the dirty Tour de France wins by Lance Armstrong when doping infiltrated the peloton.
But the Sunday Times was also quick to point out that the data of Farah and Bolt, who won two and three gold medals at London 2012 respectively, does not indicate any suspicion of doping whatsoever.
"Star names such as Mo Farah and Usain Bolt, who have been the subject of whispering campaigns, emerge as clean with no abnormal results," the paper reports.
"The data shows that star British endurance athletes such as Jessica Ennis-Hill and Mo Farah are clean from blood-doping but unknowingly competed against athletes who are suspected of cheating."
Farah has found himself enveloped by association with a doping controversy following an expose by the BBC which alleged his coach Alberto Salazar was running a sophisticated doping regime at Nike's Oregon Project.
Salazar firmly denies all allegations made against him and there has never been any suggestion that Farah was involved in any illegal practices.
However, the 5,000m and 10,000m Olympic champion has found himself having to defend his integrity after it emerged he missed two tests in the build-up to London 2012.
Bolt, as the fastest man in history and a six-time Olympic champion, has been the subject of whisper and innuendo by those trying to reconcile his records with the knowledge that so many other athletes who have recorded the fastest 100m times in history have been implicated in doping.
But the huge trove of data handed to the Sunday Times by a whistleblower says both men are competing clean.
WADA alarmed by extent of allegations, orders probe
Athletics in crisis as data leak reveals 'extraordinary extent of cheating'