Steve Asmussen, the accomplished trainer under investigation for cruelty to his horses, has rehired Scott Blasi, the assistant trainer at the center of the accusations who was caught on videotape speaking profanely and cavalierly about the stable’s injured horses.

Blasi was back at the Asmussen barn Tuesday in Saratoga Springs, N.Y. He had been fired in March within days of the release of the videotapes, which were secretly recorded in an undercover investigation by People for the Ethical Treatment of Animals.

Asmussen, the second winningest trainer in North America, and Blasi are under investigation by racing officials for cruel and injurious treatments to their horses, administering drugs to them for nontherapeutic purposes and having one of their jockeys use an electrical device to shock horses into running faster.

In its investigation, PETA used a hidden camera to record seven hours of video that showed mistreatment of the horses to be widespread. The group produced a 285-page report about Asmussen’s operations that consisted of the investigator’s notes, medical documents and reports from veterinarians who reviewed the videotape.