Kentucky Derby winner Medina Spirit fails drug test, prompting trainer's suspension

Churchill Downs suspended trainer Bob Baffert from entering horses at the track and suggested that it would invalidate the Kentucky Derby victory of his horse, Medina Spirit, if the results of a failed postrace drug test are upheld.

Churchill Downs' announcement comes after Baffert announced the failed drug test, which he vowed to fight "tooth and nail."  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.