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In this June 30, 2008 file photo, urine samples from Chinese athletes are recorded upon arriving at China Anti-Doping Agency in Beijing. So far, 31 unidentified athletes in six sports from 12 countries have been caught in retests of samples from the 2008 Beijing Games. Results on tests of 250 samples from the 2012 London Olympics will be known soon.

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Inside a non-descript concrete building in a Swiss parking lot lies evidence that could take down dozens of Olympic athletes.

By Associated Press May 22, 2016