The United States was disqualified Monday from its fourth-place finish in the Olympic team dressage event for a positive drug test. The International Equestrian Federation (FEI) said US rider Courtney King's horse Mythilus tested positive for the banned substance felbinac. The medication is used as an anti-inflammatory pain reliever. The FEI said the disqualification was automatic, despite a plea from the United States Equestrian Federation (USEF) on behalf of King's teammates Steffen Peters, who rode Ravel, and Debbie McDonald on Brentina.