LOUISVILLE, Ky. (AP) — Churchill Downs suspended trainer Bob Baffert from entering horses at the track and suggested that it would invalidate Medina Spirit’s Kentucky Derby victory if the results of a failed postrace drug test are upheld. The track said in a statement Sunday that failure to comply with the rules and medication protocols jeopardizes the safety of horses and jockeys, the sport’s integrity and the Derby’s reputation. “Churchill Downs will not tolerate it,” the statement said.