You recone the horse was drugged. Or what?
I believe it isn't if performance enhancing drugs were used , it was if they could get it clean enough to beat the test in time or if the drug cocktail had just a little too much of the wrong ingredient to show on the test.
with the money at stake a weekly drug test from 12 weeks before the race for every entry should be required and make sure it is done by the track vet and not any vet.
same goes for athletes , drug test every one from the start of spring or fall training depending on the sport want to make millions , try it clean