Adam old mate, there is always the "innocent victim" my father inlaw worked in the correction system for 40 years and he can tell you he never met a prisoner who admitted guilt!! TRUE!!.
I see a few red herrings in your argument as well,...."build up" "ban Jumps", seriously mate I have been around for a while and have seen all manner of defense for the guilty ( who wish to be protrayed as victims), that is why the rules changed a while ago to "no treatment of ANY kind on raceday", and mate if you think all trainers are adhereing to that rule you are living is disneyland, MANY have "husbandry" techiques finely tuned in order to reduce the chances of detection.
the no treatment rule on raceday was brought in to try and reduce the cheating because it is so F___ing prevalent by "progressive" trainers, people who prefer that term to cheats.
cheers,
Dan