Usain Bolt will lose one of his nine Olympic gold medals after Jamaican teammate Nesta Carter tested positive for a banned substance. Carter was part of the Jamaican quartet that won the 4x100m in Beijing in 2008 . Carter failed the dope test issued by the International Olympic Committee (IOC) when he tested positive for the banned stimulant methylhexaneamine. Usain Bolt made history by completing an unprecedented 'triple triple' in Rio 2016.
