Athletes have, on occasion, mounted successful defences of sabotage in doping cases.

Opinion: Why are athletes doping in Olympics?

Doping scandals have dominated the build-up to the 2018 Pyeongchang Olympics.

Opinion: Russian Olympic doping calls for different approach in future Olympics

Stepanova's revelations exposed massive doping in the country, leading to suspension of several Russian athletes

IAAF: Russian doping whistleblower Stepanova eligible to compete as independent neutral in Rio

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Opinion: Why are athletes doping in Olympics?

Opinion: Russian Olympic doping calls for different approach in future Olympics

IAAF: Russian doping whistleblower Stepanova eligible to compete as independent neutral in Rio