2012 Olympics News
Kipsang won the 2014 New York Marathon and 2017 Tokyo Marathon.
The IOC said Hristov`s London Games sample tested positive for a prohibited anabolic steroid (oralturinabol) when it was re-analysed.
The report said that among the findings four Sochi gold medallists had samples with physiologically impossible salt readings, while 12 Russian Sochi medallists had evidence of tampering with the bottles containing their urine samples.
The IOC ordered new tests on hundreds of samples after Russian sport was found to be involved in mass doping.
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