- Russian whistleblowers lament IOC's failure to ban Russia from Rio
- The Stepanovs believe it will allow Russia to continue doping at future Games
- Couple's evidence first exposed in 2014 German documentary
- Led to the first independent WADA report last November
(CNN)The whistleblowers whose evidence was key to revealing the extent of Russian state-backed doping have slammed the International Olympic Committee's decision not to ban the entire team, saying it is sends a signal to the sporting superpower can simply carry on as before.