How close is the scent of pseudo drugs to that of narcotics?

Pseudo drugs do not smell like real drugs to humans. They have a distinct smell but this smell is not like that of the real drug.

I cannot comment on a how a dog smells and compares pseudo. I can say this: every dog that is trained on pseudo will always hit on the real drugs. I have heard of dogs that will hit on real drugs that do not hit on pseudo. I have not personally seen this.

I am not a fan of using pseudo drugs after the first couple of weeks of imprinting the drug scent in training. Pseudo drugs are not narcotic. They are therefore not illegal to have. How can a K9 Officer that regularly trains with pseudo testify that his dog only hits on illegal substances? Where does the probable cause go? I would not want to be the officer that has to justify this in court.