Kingston, June 13: Jamaican sprint superstar Usain Bolt on Monday said the possibility of losing a gold medal is "heartbreaking", as his 4X100 metres relay team-mate Nesta Carter is said to have tested positive for a banned substance during the 2008 Beijing Olympics.
Carter, who helped the 4×100 team to Olympic and world championship titles, is said to have tested positive for the banned stimulant methylhexanamine during re-testing where 454 samples from the Beijing Games were used.
(Usain Bolt wins 100m in 9.88 seconds at Racers Grand Prix)