Closed Captioning ON OFF apply | reset x Text Display Background Enhancements font Times New Roman Arial Comic Sans size T T T T color share link July 15th, 2013 Sprinter Tyson Gay fails drug test The 30-year-old American sprinter said he will be pulling out of the world championships after failing a drug test for a banned substance. More video Sponsored Content Now Playing PREVIEW: Indiscretion Sponsored Content Now Playing Chris Christie targets Donald Trump Sponsored Content Now Playing Hilton raising optimism Sponsored Content Now Playing Average vehicle age hits a record NBC News Drupal Now Playing Rock on! What famous band was first called Smile? Now Playing Netflix says Olsen twins 'teetering' on joining 'Fuller House' Now Playing Mary J. Blige, Queen Latifah cast in NBC's live musical 'The Wiz' Now Playing Does this make scents? Experts say there's no such thing as a bad smell Most Watched Now Playing Sponsored Content Mothers of teens missing at sea have faith in their skills: 'They're out there' Now Playing Sponsored Content Hope to It: Helping homeless women start over Now Playing Sponsored Content Madeleine McCann detectives contact Australia about remains Now Playing Sponsored Content Jen Welter becomes first female coach in the NFL Now Playing Sponsored Content Still no sign of 2 Florida teens who are missing at sea Now Playing Sponsored Content Mike Huckabee: Jews support my Holocaust comments Now Playing Sponsored Content Trump's attorney sparks outrage, saying: 'You can't rape your spouse'