Usain Bolt talks about the London 2012 Olympics and drugs

Usain Bolt believes it will take time for people to believe that his performances are possible without doping. The 23-year-old Jamaican, who won three Olympic titles in world record times in Beijing last year, clocked the fastest 100 metres ever recorded in Berlin in August, winning the World Championship title in 9.58 seconds. "I'll continue running fast, I am clean without a doubt," said Bolt, who has four of the ten quickest 100m times in history and five of the top ten 200m times. "As soon as you start running fast there's going to be a problem. "It's going to take a couple of years for people to start believing that you're actually clean."

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ITN | October 30, 2009

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