Turning you children over to the public school system puts them at similar mind control risk.
The hypnotist warned the audience, especially the front row, would be right in the middle of something, walk over and snap his fingers in front of someone and bring them out of the trance. He also explained post-hypnotic suggestion and the old, can't make you do anything you wouldn't do if "not in an altered state (my words)".
I don't think I ever told my parents and certainly didn't know that was going to happen. It's a common teen group name but I can't remember it.
It would probably depend on the individual and dare I say the status of their spirituality or self-control (possibly). To me, there would be a fine line between outright hypnotism and the power of suggestion.
Even the latter could conceivably be used in an evil or self-serving way; otherwise it could be very positive like a person is worried about something and you counter it with a positive thought or just encouragement.
That is the same way I view Catholic schools.