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Police are allowed to obscure the truth, distort facts, and outright lie to suspects in criminal investigations, and the confessions are admissible even when the suspects are tricked into making them.
Law Enforcement interviews and interrogations conducted in the process of a criminal investigation are very different than Military Intelligence interrogations - they fall under very different rules and regulations. The biggest difference, of course, is Miranda.
There is also a big difference in LE between investigative interviewing, to gain information to assist in the investigation, and the suspect interrogation, when LE is attempting to elicit a confession or admission of guilt from the source - without compromising that confession in a manner which would result in it being thrown out of court.
In interrogations in Iraq, we're not looking for confessions - we're looking for intelligence information that will enable us to stop or prevent attacks and to identify and roll up the insurgent network. Although the communications skills used in military interrogations are essentially the same as in LE interrogation, the manner in which they are used is very different. The Cognitive Interview method, which is now replacing the Reid Technique in many agencies, contains many elements which have been part of the training of military interrogators for decades.
But for a long time, most LE interrogation has been based upon the Reid Technique, which doesn't parse over very well into intelligence interrogation. The Reid Technique involves a theme which offers moral justification for the suspect's crime. The theme is presented as a monologue and the suspect is discouraged from offering denials or explanations for the incriminating evidence. This technique is successful because it establishes a level of rapport between the interrogator and suspect, and - due to human nature - the suspect begins to believe that the LE officer conducting the interview may be more lenient since he obviously understands the crime.... This is definitely a form of psychological manipulation, and is very effective when used by a skilled LE interrogator.
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Police also manipulate the environment in which the questioning takes place. They isolate people in individual rooms so they can not talk with accomplices...
Setting the environment to the advantage of the interrogator is common sense, and done whenever possible - both in LE and in military operations. Segregating prisoners so they can not concoct stories or plan a course of action is also a very simple preventative measure. I don't believe there is any controversy in either principle.
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...they can turn up the thermostat in the interrogation room to increase discomfort and heighten anxiety.
This only becomes an issue when it crosses the line between heightening anxiety into causing severe discomfort. There does exist the gray area here in the space between psychological pressure and torture. For example, exposure for prolonged periods to extreme heat in an enclosed room with no air-flow definitely steps well over the line, as does stripping prisoners naked and leaving them for prolonged periods in extreme cold.
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They play out psychology routines with the suspect including classics like Good-Cop-Bad-Cop, Ego-Up/Ego-Down, or Your-accomplice-is-squealing, so-you'd-better-cut-a-deal-now, etc. All of these things are designed to apply psychological pressure to make a suspect crack and tell the police what they want to know. Of course, sometimes a suspect cracks because their guilty, and sometimes they crack for other reasons when they are actually innocent.
These are all very simplistic methods, which are still effective when tied in with the afore-mentioned structured environment and a skilled interrogator. But I don't see any link with those basic approaches and the formation of naked pyramids, simulated sex-acts, psuedo-electrification, and all the other, far more brutal methods, that have come out thus far in the investigation.
In the military, we do "draw the line", we do have policies and procedures in place to ensure that we do not slip through the gray areas into committing blatant violations of the Law of Land Warfare in the handling, treatment, and interrogation of prisoners. If you get an opportunity to read through Army Regulations and Field Manuals on this subject, you will see that quite clearly. What we have had in Iraq is a massive systemic failure in training, conduct of operations and leadership.