Hong Kong - The horse ridden by former Olympic champion Rodrigo Pessoa at the Olympics has tested positive for a banned substance, the International Equestrian Federation (FEI) confirmed on on Friday.
A B sample has confirmed the positive test on Rufus following a control after the Olympic individual final on August 23 where Brazilian rider Pessoa finished fifth.
The test has shown traces of the prohibited stimulant nonivamide, the FEI said.
Pessoa, who won gold in the individual event at the 2004 Athens Games, is the sixth rider to have his horse be tested positive for banned substances at the Beijing Games.
Their teams are set to face a FEI disciplinary panel. (dpa)