Story highlights Second set of London, Beijing retests

23 were medalists from 2008 Olympics

98 athletes tested positive from 2008-12

15 tested positive from London Games

(CNN) Is there any chance that Rio will be a drug-free Olympics?

New analysis from the previous two Games has confirmed that 45 athletes tested positive for banned substances.

The International Olympic Committee made the announcement Friday after a second set of samples provided at the London and Beijing Olympics were reanalyzed.

According to information provided by the IOC, 23 of the 30 Provisional Adverse Analytical Findings (PAAFs) from Beijing were medalists, based on "A" samples across four different sports and eight different countries.

The London 2012 retests were even more conclusive, with 15 athletes' secondary "B" samples showing positive for drugs. These Adverse Analytical Findings (AAFs) involved 138 selected samples from two different sports and nine different countries.

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