There are two types of hypnosis: that of the commerical type which does tricks on a stage and that of the kind used by police to bring memories back to the forefront to remember key points that can have the points revealed guide a police force's investigation. The main difference between the two is that the police's use of hypnosis must not ever use leading questions; if leading questions are used, even a little, the results are considered botched. Certain military establishments use hypnosis along side the use of drugs. They think that the use of drugs brings more memories back than hypnosis alone. The Randlesham Forest event made the witnesses undergo drug assisted interrogation as the people in charge didn't want to have their people lying to them or making up stories that could be used by the adversary. It was thought that the Soviet's might use UFO witnesses to spread their world view when people say that they were told of a new utopia that the aliens chose to tell to the witnesses of them, which just happened to follow the communist ideals.

Hypnosis doesn't work on everyone. It takes a certain type of person to be able to make use of hypnosis. Meditation works on most everyone, and is a form of hypnosis, just staying aware of most of what's going on. There are audio products that people sell that are meant to be consumed during sleep. The audio gives repetitive messages to your unconscious self to help you out with messages about quitting smoking, being more determined in your studies, or bringing you to a deeper level of sleep so that one feels more rested.

The police use hypnosis because they believe that it works, and they're right.
There are training programs out there that specialize in educating the police on how to do professional hypnotic interviews. There are many different sources who claim to be experts in hypnosis, however those who are recognized by the police establishment are few.

Some ideas for you,
Cheers!
-warmfuzzy

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