All samples collected from horses that ran in the Breeders’ Cup World Championships Nov. 2-3 at Santa Anita Park, in Arcadia, Calif., have been cleared by the Kenneth L. Maddy Equine Analytical Chemistry Laboratory at the University of California, Davis (UC Davis), the California Horse Racing Board (CHRB) said Nov. 6.

The samples were couriered to UC Davis Nov. 4, allowing testing to begin within 24 hours of the final Breeders’ Cup race, the Breeders’ Cup Classic.

All horses underwent pre-race testing for total carbon dioxide levels in blood. Post-race testing was performed for prohibited drugs on the first four finishers in all Breeders’ Cup races plus additional random horses selected by the stewards consistent with CHRB protocol. Post-race testing was done on both blood and urine samples. The Maddy Laboratory’s standard protocols look for more than 45 anabolic steroids and hundreds of other prohibited drugs.

Beyond expedited processing, Breeders’ Cup samples required no special handling from everyday CHRB testing requirements