year. baffert denies in i wrongdoing at churchill downs and disputes some of the violations. he and other trainers blame a patch work of testing that doesn t account for differences between horses. some of these trainers, bob baffert himself, argued that such a small amount could be detected, a lab testing is so sensitive. it is a very small amount and this is very potent and that is most important thing to identify with the medication, is it s potency. we re under tremendous pressure to improve how we handle things. reporter: horseman has won and placed in triple crown and said it is time for a change. the scrutiny is warranted. it is unexcusable to have seven or eight horses die the week of the kentucky derby. but we need to be better regulated. congress created new nationwide rules just went into effect to standardize medication for race horses.