From Inside the Games
The International Olympic Committee (IOC) have revealed that 30 athletes from Beijing 2008 and 15 from London 2012 have tested positive in the second wave of doping retests from the last two Summer Olympic Games.
A total of 23 medallists from Beijing 2008 produced provisional adverse analytical findings as a result of the second wave, which was predominantly focused on athletes who reached the podium in the Chinese capital.
The IOC said that the 30 athletes from the Games came from four sports and eight National Olympic Committees (NOC).
Two sports were implicated in the 15 positives from the London 2012 Olympic Games, coming from a spread of nine NOCs.
The IOC opted to extend their re-testing programme of doping samples from Beijing and London to include all medal winners at the Olympic Summit last month in Lausanne.
It expanded on the targeted re-analysis of athletes due to compete at Rio 2016 completed last month.
A total of 30 tests came back positive in the first wave of testing from Beijing, while 23 were detected from London.
Initially 31 athletes had produced positive samples from Beijing, but the B-samples on two tests came back negative, while a further failed test was also recorded.
After the first two waves of testing, 1,243 doping samples from the Games have now been reanalysed, resulting in 98 positive tests.