I think you are confusing sourcing with training. TSA obtains its dogs from a variety of sources (US DoD, private vendors). The dogs it obtains are untrained (except for the basic sit, stay, etc). The dogs are then evaluated for a period of time for suitability for detection work and if deemed suitable, then they are paired with a handler and both go through NEDCT program together. TSA does not use any canines already trained in detection discipline.

It seems to me that article was poorly written (shocking for a wire service, I know) and the writer simply included a term for a subject about which s/he was familiar but not knowledgeable. That was a demo of PSCs. I believe some state/local agencies are training narcotics canines for working crowds such as at large public events (although I do not know how that passes constitutional muster - topic for another forum) but TSA simply is not training PSCs for narcotics.

You will be pleasantly surprised - most LEAs, including airport police departments LOVE to demonstrate their dog teams and their abilities to the public. Just call up and ask when you can drop by for a demo. It might have to be with an already scheduled demonstration (school groups, scout troops, civic groups, open houses) - but I will be very surprised if they deny you an opportunity. While you are out there get a tour of the fire dept - they love to show off their cool truck and toys.