No traces of a powerful painkiller were found in sample testing from horses running in this year's Kentucky Derby and Kentucky Oaks.That’s according to a report this week from state horse racing regulators.Kentucky recently began testing race horses for dermorphin, a substance more powerful than morphine. It follows a recent outbreak of positive tests for the substance at Louisiana tracks, resulting in suspensions for several trainers.Officials for the Kentucky Horse Racing Commission say they have no reason to believe the drug is being used in Kentucky. But they say the prevalence of the drug in other states means the commonwealth must continue testing.Officials say post-race urine samples from five of the 20 Derby horses were tested for the substance, as were samples from four of the Oaks entries.
