A pair of top contending horses trained by Bob Baffert have tested positive for lidocaine, a banned substance, according to multiple reports. Charlatan, an undefeated colt, was one of the horses that tested positive. Charlatan won a split division of the Arkansas Derby in the beginning of May and is one of the top ranked horses for the Belmont Stakes in June. 

The other horse to test positive was 3-year-old filly Gamine, who won at Oaklawn on May 2, the same day Charlatan won in Arkansas.

The drug in question is known by the Association of Racing Commissioners International as a Class 2 drug. The penalty listed is a 15-60 day suspension as well as a fine from $500 to $1,000 for a first offense, The New York Times reported. According to The New York Times and Louisville Courier-Journal, the testing on the horses was done during a meet at Oaklawn Park in Hot Springs, Ark.

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A horse can be disqualified and forced forfeit the prize money if found positive for the drug. In the Arkansas Derby, Charlatan took home a $300,000 prize for the first place finish.

Baffert, who has trained two Triple Crown-winning horses, spoke out against the positive tests to the New York Times:

"The rules of the Arkansas Racing Commission mandate confidentiality concerning any investigation into an alleged rule violation until there is a written decision of the Stewards. I am extremely disappointed that, in this instance, the Commission has not followed its own rules on confidentiality," he said. "I am hoping for an expedited investigation and look forward to being able to speak soon about any written decision of the Stewards, if and when it becomes necessary and I'm allowed to under the Commission's confidentiality rules."

When asked by The Associated Press about why the first test results from both horse were leaked before the second ones were conducted, Baffert said, "I think it's a great question that someone besides me should answer."