Maicol Siqueira, a 33-year-old Brazilian taekwondo athlete, has been banned for two years due to violations of anti-doping regulations. The International Testing Agency (ITA) stated that Siqueira failed to provide a no-notice sample for drug testing on three occasions within a year, which constitutes a breach of the anti-doping rules. He achieved notable success by winning a bronze medal in the men's 80-kilogram category at the 2016 Rio de Janeiro Olympics and contributed to Brazil's team gold at the 2023 PanAmerican Games. The ban is effective until January 18, 2028. Under global anti-doping policies, athletes are required to declare a specific one-hour timeframe each day when they are available for testing, and missing three such notifications within a year can lead to disciplinary action.