The Deception

The Deception with Keith Barry is one nice program on discovery channel. Its all about psychology and hypnotism. There is a belief that in hypnotism it is possible to make a person go sleep and make them talk in their subconscious state. In the deception there are few cases where Barry reads peoples mind and tells the persons ATM pin figures exactly one by one just by looking at the persons face, which appears to be little overlooked and makes us think is it possible ?
Based on my knowledge.. for interrogating criminals and terrorists Intelligent Agencies use drugs to make them unstable and then try to get answers they want though it is not 100% accurate. But in Barry's case he seems to make people fall in their subconscious state so instantly just by telling few words.
The sleeping agent is another case where he makes a person go sleep and then transform that person into a sleeping agent who does what ever Barry asks him and its also demonstrated in a coffee shop.
If this is true why doesn't governments use these mentalists to negotiate with all the terrorist and avoid all the catastrophes they have done :)