the previously assigned date without playing for the third position. Therefore, the technical delegate ruled that Mexico and Nicaragua were each to be awarded a bronze medal. First ever gold medal NOC's without medals Changes in medal standings The event closed on July 29 without a positive test for illegal drugs. During the closing ceremony of the Games, the Rio de Janeiro Organizing Committee called them the "cleanest [Games] yet". Mario Vazquez Raña, president of PASO, stated at the closing ceremony that the games had been the cleanest in Pan American history. However, shortly after the games ended, prohibited substances were detected in 4 of 1,262 tests. Following procedures recommended by the World Anti-Doping Agency (WADA), the PASO Medical Commission conducted an extensive review and submitted a report to the PASO Executive Committee. On December 18, 2007, the executive committee unanimously approved it, stripping the medals from four athletes and ordering an adjustment of the medal table. Brazilian swimmer Rebeca Gusmão tested positive for high levels of testosterone and was stripped of her four medals. She had won two gold medals in the 50 metre freestyle and 100 metre freestyle competitions, and another two medals with the Brazilian team; a silver medal at the 4 × 100 metre freestyle relay competition, and a bronze medal at the 4 × 100 metre medley relay competition. Gusmão's gold medal in the 50 metre freestyle went to Arlene Semeco of Venezuela, the silver medal to Vanessa García Vega of Puerto Rico, and the bronze medal to Flávia Delaroli of Brazil. She also lost her gold medal to Semeco in the 100 metre freestyle; Delaroli received the silver medal, and García Vega received the bronze medal. The Brazilian swimming team lost its silver medal in the 4 × 100 metre freestyle relay competition to the Canadian team, which passed the bronze medal to the Venezuelan team; and in the 4 × 100 metre medley relay competition Brazil lost its bronze medal to the Bahamian team. Brazilian weightlifter Fabrício Mafra lost his bronze medal in the men's 105 kg competition. He tested positive for abnormal levels of testosterone, and Damian Abbiate, the competitor from Argentina, received the medal in his place. Colombian cyclist Libardo Niño Corridor, who won a silver medal in the men's individual road time trial, tested positive for the banned substance erythropoietin (EPO), and consequently the silver medal went to Matias Medici