The IAAF cleared marathon world record holder Paula Radcliffe of doping allegations on Friday and rejected claims that it failed to act on hundreds of suspicious blood tests, saying the accusations lacked "any scientific or legal basis."
Track and field's governing body issued a 38-page response to allegations by British and German media outlets that it had ignored and tolerated rampant blood doping in the sport.
"The IAAF is not complacent about doping in its sport," the federation said. "It will continue to use every tool at its disposal to fight doping and protect clean athletes."
The statement was released a few days before IAAF President Sebastian Coe faces a British parliamentary hearing into the doping allegations made by The Sunday Times newspaper and German broadcaster ARD.
Already reeling from revelations of government-backed doping in Russia and criminal corruption charges against former president Lamine Diack, the International Association of Athletics Federations said it had a duty to set the record straight on the blood doping issue.
"The IAAF cannot sit idly by while public confidence in its willingness to protect the integrity of its sport is undermined by allegations of inaction/incompetence that are based on bad scientific and legal argument," it said.
The IAAF singled out the case of Radcliffe, saying the three-time London Marathon winner was publicly accused of doping "based on the gross misinterpretation of raw and incomplete data."
Elevated blood value readings in some of Radcliffe's tests had "clearly plausible" explanations that were "entirely innocent," the IAAF said.
"Any competent scientist would immediately conclude that they should be disregarded," the statement added.
The IAAF said it followed up by testing Radcliffe's urine and blood samples for EPO and blood transfusions, and all the results came back negative.
"Obviously there's been damage done to my reputation, and to the reputation of the sport, and that's why I took the stand I did against this," Radcliffe said Friday after the release of the IAAF statement. "Yes, it was only me being singled out but there are a lot of other innocent, clean athletes who have or may produce an atypical value at some point.
"That's precisely why it has to be kept so confidential until an expert that's properly qualified looks at it and assesses it."
Radcliffe, who retired from competition this year, was publicly implicated during a British Parliamentary hearing in August into the doping allegations leveled by the British and German media.
She acknowledged that her blood-testing data may have shown "fluctuations" but insisted there were no "abnormalities" and experts had concluded she had done nothing wrong.
Radcliffe set the world record when she ran 2 hours, 15 minutes, 25 seconds in winning the 2003 London Marathon. She also won the New York Marathon three times (2004, `07 and `08) and the Chicago Marathon in 2002. Radcliffe competed in four Olympics but never won a medal.
The Sunday Times and ARD examined the results of 12,000 blood tests involving 5,000 athletes from a leaked IAAF database covering 2001 to 2012 and concluded there was evidence of widespread cheating.
The reports said that 146 medals — including 55 golds — in disciplines ranging from the 800 metres to the marathon at the Olympics and world championships were won by athletes who have recorded suspicious tests. The Sunday Times also claimed the London Marathon was won seven times over a 12-year period by athletes who recorded suspicious tests.
The IAAF said Friday that its biological passport program — which monitors athletes' blood profiles over time for evidence of doping — began in 2009 and that all screenings done before then could not be used as proof of doping.
"No charge could ever be brought based on the pre-2009 tests," the statement said.
The IAAF said it would respond separately to allegations made in a report by a World Anti-Doping Agency commission this month that IAAF officials swept aside up to eight blood doping cases in 2012, allowing athletes to compete at the London Olympics when they should have been suspended.
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