美国田径又出兴奋剂事件 世锦赛亚军被禁赛

Group 1 - The core issue revolves around a doping scandal in American athletics, specifically involving sprinter Bracy, who received a 45-month ban for two doping violations [1] - The US Anti-Doping Agency (USADA) initiated an investigation after receiving a tip-off in early 2024, leading to Bracy testing positive for steroids [1] - Initially, Bracy's ban was reduced to 21 months due to his cooperation with the investigation, but he later violated athlete whereabouts rules, resulting in an additional two-year ban [1] Group 2 - Two other American sprinters from the Oregon World Championships have also faced bans: sprinter Clee was banned for doping violations, while sprinter Naton received a four-year ban after testing positive for steroids during an out-of-competition check [1]