People with borderline mental health can be pushed over the edge with hypnosis. Logic in deep hypnotic trances is distorted and irrational. Say Frank was being hypnotized and was in a deep trance. He is told that he will see Shaun Coneroy in an empty chair across the room. Then he is told that Shaun Coneroy is standing beside him. He sees both Shaun Coneroys & is confused as to how there are two of them but he accepts that there are two Shaun Coneroys in the room quite readily.
It is also illegal for a hypnotized person to be convicted of murder. However most hypnotists claim that under hypnosis a person will only do what he or she has within them. So if you hypnotized a serial killer they would probably commit murder but if you hypnotized a charity worker who had devoted her life to helping children in Africa and was a vegetarian the results would be much different.
For suggestion related issues I recommend:
Sources:
Experience
http://www.thecrimson.com/article/2002/4/11/harvard-professor-demonstrates-hypnosis-is-real/
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