Medina Spirit, ridden by jockey John Velazquez, leads the field to the first turn during the Kentucky Derby on May 1 at Churchill Downs in Louisville, Ky. The colt has failed a second drug test following the race. Updated June 2, 2021 at 5:18 PM ET Churchill Downs, the Louisville home of the Kentucky Derby, has suspended horse trainer Bob Baffert after Medina Spirit, the colt that won this year's running of the Derby, failed a second test for banned substances, the company announced Wednesday.