By Jess Hallas-Kilcoyne - Just as human athlete doping occurs in nearly every major sport, so too can equine doping be found in just about every discipline in equestrian sport. Horse racing has historically been the sport that has attracted the most scrutiny with regard to horse doping, but a slew of highly publicized incidents over the past decade have led to increased awareness of illegal drug use in horses in other equestrian sports. Most notorious are the positive drug tests that resulted in the re-allocation of medals at the 2004 and 2008 Olympic Games.