LAUSANNE, Switzerland (AP) — The World Anti-Doping Agency is concerned that Russian whistleblower Yulia Stepanova won’t be allowed to compete in Rio de Janeiro after “courageously exposing the single biggest doping scandal of all time.”

Evidence of widespread doping in Russian track and field was provided by 800-meter runner Stepanova, who hoped to compete in Rio as an independent athlete.

The IOC, however, ruled Sunday that her past doping ban means she cannot race at the Olympics next month.

WADA director general Olivier Niggli says the organization “is very concerned by the message that this sends whistleblowers for the future.”

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