<prompt> Nyora kupfuurira kwechikamu chino - 2.Muna May 2014, US 4 × 100 metres relay  <response>: nhengo yechikwata 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. 