Justin Gatlin answers questions about the comeback from a positive test

Justin Gatlin did not react much to the news of a positive test from Tyson Gay. He didn't expect it, but maintained his focus on the 2013 World Championship in Moscow. On Thursday, he met with the media and answered questions about the comeback from his positive test and where he sees the credibility of the sport, especially the sprints. Gatlin continues to believe the United States will fare well against the Jamaicans in Moscow and issues advise to young athletes about the vitamins and supplements they take.