Kentucky Derby winner tests positive for banned substance

Medina Spirit is in jeopardy of losing its winning crown after the animal tested positive for a steroid after the race, according to the Kentucky Racing Commission.
2:54 | 05/10/21

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Transcript for Kentucky Derby winner tests positive for banned substance
Now that Kentucky derby bombshell. Winner Medina spirit failing a post-race drug test and throwing that victory into question. The horse's trainer now suspended, but he is denying wrongdoing. T.J. Holmes is here with that. Good morning, T.J. Reporter: Good morning to you, stra. The biggest star year after year is a man, Bob baffert. If you don't know the name -- if you've watched the race, you have seen him with the white hair and sunglasses, that guy. A hall of fame trainer who is now accused of wrongdoing in the sport's biggest race. Bob baffert does it again. Medina spirit won the Kentucky derby. Reporter: After crossing the most prized finish line, now possibly losing that crown. Testing positive for a steroid in the commission. It was a gut punch. Reporter: But Bob baffert is awaiting the results of another test to confirm the accuracy of the initial positive result. Injustice for the horse, but we're going to fight it. Reporter: The steroid which is considered a therapeutic is legal to use, but not allowed to be in the horse's system on race day. Baffert who has seven Kentucky derby wins under his belt is no stranger to controversy over the years, and this is his fifth horse to fail a drug test in a year. The trainer denies any We know for certain that we did not give him that. We're talking pikograms, and that is, like, a grain of salt. That would have no effect, but it's enough for -- to have a red flag. Reporter: Baffert is now suspended from the track where he tasted victories just days ago. Barred from any horses at Churchill downs racetrack. If it's confirmed, you could have the winner of the most famous race in the country disqualified from victory. So baffert says Medina spirit will continue racing in all the races for the triple crown while they await test results. If they are disqualified, the runner-up would be the winner. What happens to all that money people bet? Some $155 million bet, you keep your money. That is not going to change even if the results change. All the bets are final. You get to keep your money, but put it in a shoe box in case somebody comes looking for you. You don't get your money back if you bet on the losers? All the money that exchanged hands is final, no matter if the results change because of a diskalification. George, you're good. Or not. The second place horse, and I still don't get my money when they're declared the winner. Wow. Thank you. We have the Chinese rocket

This transcript has been automatically generated and may not be 100% accurate.

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