<prompt> Pedzisa mutsara unotevera: 2.Muna May 2014, US  <response>: Nhengo yechikwata che4 × 100 metres relay Tyson Gay akagamuchira kumiswa kwegore rimwe nekuda kwekushandisa anabolic steroid uye akabviswa menduru dzake mushure me15 Chikunguru 2012 paakatanga kushandisa. Muna May 2015, IOC yakanyorera US Olympic Committee ichivaudza kuti vatore menduru kubva kune vamwe vavo Trell Kimmons, Justin Gatlin, Ryan Bailey, Jeffery Demps naDarvis Patton. Vaviri vaGay vaaitamba navo vakamhanya naye mumakwikwi okupedzisira, Kimmons naBailey, vakanga vambomiswawo basa. Menduru dzakagoverwazve, neTrinidad neTobago vakapiwa sirivha, uye France ichitora ndarira. 