Doug O'Neill, Hollywood Park's leading trainer, will run his horses out of a detention barn for the next 30 days because one of his starters tested over the permitted level for total carbon dioxide in ...

An Albury trainer has been suspended because a pre-race sample taken from one of his horses returned a total carbon dioxide concentration reading above the threshold. Elevated TCO2 readings are ...

Chris Englehart, the trainer of the ill-fated Formal Attire, will begin serving a 60-day suspension on Thursday after one of his horses exceeded the allowable limit for total carbon dioxide in a ...

As Churchill Downs prepares to host the Breeders' Cup World Championships, Kentucky regulators are examining the state's drug-testing policies and procedures. Upgrades, however, may hinge on state ...

Starting next Wednesday, the New York Racing Association will begin testing to determine if any horses have been given illegal “milkshakes” before a race. A “milkshake” is the administration, through ...

Many racing fans have been perplexed of late with horses being scratched shortly before the start of races because “total carbon dioxide (TCO2)” levels are “above the international threshold of 36 ...

SAN JUAN, Puerto Rico -- A Puerto Rican horse that can't win a race now has a claim to fame. Dona Chepa, a 9-year-old mare, finished last in a six-horse field at Camarero Racetrack in eastern Puerto ...

Three winning horses in June tested positive for prohibited substances in their blood and their trainers have been handed hefty fines by the National Horseracing Authority (NHA). All three horses have ...