It wasn't the first time Blake Leeper had received an email from the U.S. Anti-Doping Agency.
As a top Paralympic sprinter — a young man who could fly down the track on sleek, artificial legs — Leeper had been drug-tested regularly and seen lots of messages from the agency.
But when a USADA email popped up on his cellphone in the summer of 2015, he sensed trouble.
"Worst feeling of my life," he says.
The man from Tennessee had shot up the ranks of his sport as a relative newcomer, running fast enough to win silver and bronze at the 2012 Paralympics in London. Natural-born speed was only part of the story.
His down-home charm earned him...