I don't control the subject. On the Footy Show, the hypnotist did control the Channel 9 crew.
If the subject can get immersed into a book or movie, he/she will be good at reaching a hypnotic state > good chance of recalling info.
If the subject has poor cognitive skills or ADD, he/she will not have the ability to get immersed.
I don't mind doing the occasional pro bono, so long as the client is motivated - otherwise it's like pushing sh!t uphill. Tis a very interesting profession + rewarding.