The London Olympics women's 1500m champion Asli Cakir Alptekin of Turkey was cleared of doping violations by the Turkish athletics.
On May IAAF suspended the 2012 Olympic champion and asked the Turkish athletics federation to investigate Asli Cakir Alptekin's case after WADA found abnormal blood levels on her biological passport.
The Turkish athletics federation said on Thursday that the athlete did not violate any anti doping rules.
The IAAF can still appeal the ruling to the Court of Arbitration for Sport.
If found guilty the athlete could face lifetime ban since she already served 2 year ban after she was found cheating with drugs at the 2004 world junior championships.
Another high profile track and field athlete the European 100-meter hurdles champion Nevin Yanit was also investigated and later banned from competition for two years.
This year the Turkish sports had been overshadowed by the series of doping violations, after 31 athletes were suspended right before the IOC voted for the 2020 Summer Olympics host city. Turkish capital city Istanbul was one of them.
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