Aaron Rathy of Canada tests positive

GUADALAJARA, Mexico -- Canadian wakeboard silver medalist Aaron Rathy tested positive for a banned stimulant, the first person to fail a drug test during competition at the Pan American Games.

Rathy tested positive for methylhexaneamine, organizers said Friday. His medal was withdrawn and he was disqualified from the competition.

"The athlete is cooperating fully, has accepted responsibility and apologized for the inadvertent use of a banned substance," the Canadian Olympic Committee said in a statement. "While the COC does not condone the use of banned substances, we are supporting the athlete's right to a fair hearing and due process."

According to the Canadian Olympic Commitee, the Pan American Sport Organization's Disciplinary Commission Panel held a hearing Friday and made its decision.