The California Horse Racing Board said Nov. 4 all urine and blood samples collected from horses in the Breeders' Cup World Championships Nov. 1-2 at Santa Anita Park have tested negative.
Testing was performed at the Kenneth L. Maddy Equine Analytical Laboratory at the University of California-Davis.
Under standard protocol in California, all horses that raced in the Breeders' Cup were pre-race tested for TCO2 levels in blood. Post-racing tests were performed on urine and blood samples from the first four finishers in all 14 Cup races; additional horses were tested randomly at the discretion of the stewards.
As reported earlier by Dr. Rick Arthur, equine medical director for the CHRB, out-of-competition tests on 25% of the horses pre-entered in the Breeders' Cup also tested clean.
The CHRB said standard protocol involves testing for 45 anabolic steroids and "hundreds of other prohibited drugs."