The Bob Baffert-trained horse was clean in the first of three additional tests
The tests were mandated after the colt tested positive for the steroid betamethasone following the Kentucky Derby
Baffert said Tuesday that he believed an ointment used to treat dermatitis was responsible for the results
He initially said Sunday that he did not know how the drug had entered the horse s system
The results of the other two tests are expected later today
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