Won't happen.  It would require changing the horse industry.  Drugs commonly dispensed by veterinarians would be prohibited.  Drugs commonly sold by retail for horse care would be impacted.  You would need MORE testing done by Ag on horses.  The majority of domestic horses would have to be scrapped, as they currently receive or have received banned drugs already.  Now if we want to compete with China in the 'I don't give a flying fig'...like we do already....then why do we even have an Ag Dept...or APHIS?  We can just go back to the 'good old days' of Mad Cow, Rabies, Tuberculosis, Lethal genes, Brucellosis....because after all, once the animal is dead and consumed.  Who cares?