Former track athlete Antonio Pettigrew testified under oath to using banned substances back in the late 90s before he won medals in the 2002 Sydney Olympics. He is now an Assistant Coach at Carolina.
He was actually testifying against his former coach, Trevor Graham, who seemed to be the instigator/enabler. Pettigrew is godfather to Graham's daughter:
"Federal prosecutors called Pettigrew to testify against his former coach Trevor Graham, who is on trial for allegedly lying to investigators about his relationship with a prolific steroids dealer. Pettigrew, who is godfather to Graham's daughter, testified that he began doping at Graham's suggestion. He won a gold medal at the Sydney Games."
http://sports.espn.go.com/oly/tracka...ory?id=3409259