(FILES) This file photo taken on May 14, 2016 shows an athlete competing during the Ibero American Athletics Championships serving as test event for Rio 2016 Olympic Games, in Rio de Janeiro. IOC president Thomas Bach said on May 18, 2016 that "dozens" of athletes could be banned from the forthcoming Olympic Games in Rio de Janeiro after new tests on samples from previous games. / AFP PHOTO / CHRISTOPHE SIMON