To state the obvious horse racing was never meant to "run clean" or they would enforce the rules

with a lot bigger penalties then a slap on the wrist for repeat offenders, or $1,000 fine for multi millionaires... for those caught giving their horses toad venom, Opium, Cocaine, Meth, Rat Poisoning, Steroids, Lasix, and many other Performance Enhancing Drugs... https://narratively.com/historys-greatest-horse-racing-cheat-and-his-incredible-painting-trick/