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CAS
![Doping whistleblower to testify in Geneva as athletes appeal](https://apiwp.thelocal.com/wp-content/uploads/2018/01/5f217028acd4302de17c3d21f20daac5f7ddf8c52dc5d387d347654d2d1d0ebf.jpg)
RUSSIA
Doping whistleblower to testify in Geneva as athletes appeal
Whistleblower Grigory Rodchenkov, the source of revelations about state-sponsored doping in Russia, is expected to testify next week at a Court of Arbitration for Sport hearing involving the appeals of 39 Russians banned for doping.