Blake Leeper, one of the top paralympic sprinters in the world, has been banned for a year for a doping violation.
Officials do not believe that the 25-year old athlete had used cocaine to enhance his performance.
"I made a mistake and I am deeply sorry for my behavior and for letting all the people who believed in me down," Leeper said in a statement Monday evening. "I am taking full responsibility for the bad choices I have made in my life."
"If I can overcome the monumental obstacle of being born without legs to become a world-class athlete, I can overcome my mistakes and become a role model Olympian which I am working hard to prove in Rio. I apologize to my fans, sponsors, friends and family and I am grateful to have this opportunity to prove that anything is possible with or without legs."