Efimova had been disqualified from competing by swimming
governing body FINA between October, 2013 and February, 2015
after testing positive for traces of the anabolic steroid DHEA.
That triggered an automatic Games ban based on the IOC's set of
criteria issued for Russian competitors following revelations of
widespread state-backed doping across many sports in the
country.
CAS say that Olympic ban is "unenforceable", saying an athlete
cannot be sanctioned twice for a doping offense. FINA will now
have to decide on her eligibility.
(Editing by: Ossian Shine)
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