The International Olympic Committee has revealed that banned substances were found in 45 athletes from the Beijing and London Games.
Following a second wave of retests using the latest in anti-doping technology, the IOC found the samples of 30 athletes from the 2008 Olympics and 15 athletes from the 2012 event to be irregular.
While the IOC cannot release the names of the athletes just yet, it can reveal that 23 of the athletes from Beijing that tested positive for banned substances were medallists.
Following these results, the relevant National Olympic Committees, International Federations and the athletes themselves are informed, after which legal proceedings can begin.
“The new reanalysis once again shows the commitment of the IOC in the fight against doping,” said IOC President Thomas Bach.
While 1243 samples from the two Games have already been retested in wave one and two, wave three and four will be rolled out over the next few months.