Yes.
It takes continued personal contact from a handler to get specific results at a desired time and place. It is not a terribly reliable process - and it leaves visible tracks.
A "low-touch" option is to saturate an environment with suggestive messages and see who in the audience responds to them. After that, it only takes a little encouragement to get things moving along. This process can produce some astonishingly creative improvisations from the volunteers which would appear to defy the laws of probability.
The "low-touch" option is also quite unreliable, but it does not leave obvious provable tracks back to the sponsors.
Many thanks for that info.
Freepmail incoming.