The Horseracing Integrity & Welfare Unit Oversaw Drug Testing for the Oct. 31-Nov. 1 Breeders’ Cup World Championships at Del Mar Thoroughbred Club

All race day test samples (post-race and TCO2) collected from contenders in the 2025 Breeders’ Cup World Championships Oct. 31-Nov. 1 at Del Mar Thoroughbred Club have been cleared by the Horseracing Integrity & Welfare Unit (HIWU). Purse distribution has begun accordingly.

In 2025, the Breeders’ Cup World Championships were run for a third year under the full jurisdiction of the Horseracing Integrity & Safety Authority (HISA), including the Anti-Doping and Medication Control (ADMC) Program, which took effect in May of 2023 and is administered and enforced by HIWU.

As was the case under Breeders’ Cup’s anti-doping and medication control rules that were in place before HISA’s ADMC Program was implemented, the vast majority of medication is prohibited within 48 hours of the 14 Championship races and the undercard. All potential Breeders’ Cup competitors were also subject to out-of-competition testing for banned substances leading up to the two-day global festival of racing.