Yes based on what the representative said, my research of the lab and its systems and equipment.
Correct. They were conned as well. In many cases they were just using relabeled commonly used treatments. Hence the seller getting nailed for fraud.
Quite possible coincidental but assisted by the fact that they were suddenly proactively treating their horses for ailments that the horses had. They just didn't know they were doing it. The common drugs weren't detected because along with the fraud went a narrative of when to use and when not to use. Advice that tended to align with the withholding periods in the rules.
That said from all the samples seized and all the investigations where are these "new novel performance enhancers"? As I keep trying to through to you there is NO chemical molecule that can't be detected using modern testing methods. I've had first hand experience of the techniques in the honey industry where previously unknown active chemicals where detected rapidly when they were actually looked for. The research was based on comparing multiple honey samples to a known base control sample. Much more complex than testing horses where it is easy to get a profile of normal horse blood and tissue samples to use as a control.
FFS - there could be any number of reasons why a horse runs 4th or 5th in a Group 1 race which may have looked an improvement. I've researched some of your "miraculously improved" race performances and have found in the past that the actual performance hasn't been significantly greater than what the horse has shown from time to time. Hell it might have got a softer run than it had previously or it might have been trained harder for the big money race. BTW most trainers do that i.e. "Set the horse for a particular race".
Not all of us are looking for spiders under the bed. The point is if the big stables were using something "special" then the testing technology is available to identify what it is. I'm not sure the RIB are bright enough but would prefer to rely on anonymous tip-offs (always someone tipping or snitching), hide in hedges and then do expensive stable raids. Old school policing. What have they found? Tubing apparatus (every stable should have this), formaldehyde (the irrational reporting of this was beyond belief) and allegedly some bi-carb. Where is the mystery drug?