Richard Rasmussen/The Sentinel-Record, via Associated Press
Two horses trained by the Hall of Famer Bob Baffert tested positive for a banned substance at a recently concluded meet at Oaklawn Park in Arkansas, according to a person familiar with the testing process. One of the horses, Charlatan, won a division of the Arkansas Derby on May 2 and was considered a top contender to win the Belmont Stakes on June 20.