After their doping samples from the 2008 Beijing Olympics were retested, 31 athletes have tested positive, according to the Associated Press.
The International Olympic Committee has said that it has opened disciplinary proceedings against the athletes, who come from 12 countries. The positive results came from six sports, which were not named.
All of the athletes identified were expected to compete at the Rio Olympics this summer.
The IOC will also reexamine around 250 results from the 2012 London Olympics in the near future. Samples from the 2014 Winter Olympics in Sochi will also be tested, which comes less than a week after the New York Times and 60 Minutes reported on how Russians cheated the drug-testing system in 2014.
The results are being retested using enhanced techniques that were not previously available.