People can lie under hypnosis, but there are certain things called hypermnesia or super memory where a person in a state of hypnosis might not remember exactly what happened at a crime scene, but if you relax them and ask the appropriate questions, it can help to heighten their awareness of what happened there. You see it on television where a person remembers a license plate number or something. It just depends upon the person administering the hypnosis. In most states, it's not admissible in court, because people can lie under hypnosis, but it is useful in helping people remember more details about a crime.
