[Cobbydaler]

Is he the first North American since Ben Johnson to do so?

American sprinter Tyson Gay has tested positive for a banned substance and has pulled out of next month's World Championships.
Gay, the joint-second fastest man over 100m, said he was notified by the US Anti-Doping Agency on Friday that his A sample from an out-of-competition test in May had returned a positive.

"I don't have a sabotage story... I basically put my trust in someone and was let down," said Gay, 30.
"I made a mistake. I am pulling out of Monaco (this week's Diamond League meeting) and the World Championships."
Gay said he could not divulge the substance or how the positive test occured, adding: "I know exactly what went on, but I can't discuss it right now.
"I hope I am able to run again, but I will take whatever punishment I get like a man."