Horse racing in the United States took another major hit when news broke early on the morning of May 9 that Kentucky Derby (G1) winner MEDINA SPIRIT had tested positive for the anti-inflammatory corticosteroid betamethasone. The horse reportedly had 21 picograms in his system.

Betamethasone is listed as a Class C drug that is allowed in Kentucky but has a 14-day withdrawal requirement.  Corticosteroids are listed as Class 4 by the Association of Racing Commissioners International.  The threshold is 10 picograms.

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