Baffert-trained Arkansas Derby winner, Charlatan, tested positive for the anesthetic lidocaine in post-race testing. Lidocaine can act as a masking agent by reacting with the chemicals in blood testing kits to conceal the presence of other banned substances in a horse's system. Baffert had another horse, Gamine, that won a separate race at Arkansas' Oaklawn Park the same day as the Derby. Oaklawn Park stewards disqualified both horses and revoked the purse-earnings for both. They sent their d