Jamaican sprinter Usain Bolt, a winner of nine Olympic gold medals, has been stripped of his 4x100m gold medal from the 2008 Beijing Olympics after his fellow sprinter in the team, Nesta Carter, tested positive for banned substances on re-analysis. The 30-year-old will have to hand back one of his nine Olympic gold medals, losing the record for the triple-triple gold haul, won across three consecutive Olympic events.