In many sessions, the client doesn't even speak. In those where the client speaks, they won't tell me anything they wouldn't have told me before the session.
The military actually invested a ton of money to see if hypnosis could be used in interrogation. As it turns out, it's useless for that application. The "client" can come out of it any time they want and they won't reveal anything. Not a single thing.
You family secrets, the skeletons in the closet and the access code for your debit card will remain in your head, safely out of reach.