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Interrogation is a methodology employed during the interview of a person, referred to as a "source", to obtain information that the source would not otherwise willingly disclose. A typical purpose is not necessarily to force a confession, but rather to develop, playing on the source's character, sufficient rapport as to prompt the source to disclose information valuable to the interrogator. A well-conducted interrogation will not usually involve torture, which in practice is widely acknowledged to be ineffective at producing true, accurate, correct and reliable information. Prisoners of war routinely undergo military interrogation.
Different methods of interrogation
There are multiple possible methods of interrogation including deception, torture, increasing suggestibility, and using mind-altering drugs. The methods used to increase suggestibility are moderate sleep deprivation, exposure to constant white noise, and using GABAergic drugs such as sodium amytal.
One notable interrogation technique is the Reid technique. However, the Reid technique (which requires interrogators to watch the body language of suspects to detect deceit) has been criticized  for being too difficult to apply across cultures and is impracticable for many law enforcement officers.
In the U.S., there is no prohibition that forbids the interrogator from lying, from making misleading statements or from implying that the interviewee has already been implicated in the crime by someone else. Deception forms an important part of effective interrogation. Important legal protections in the United States of America include the right to remain silent and to demand the presence of a lawyer. (See also "Miranda warning".)
In BDSM, interrogation is like to focus more on physical means, restraint and pain play being common, although other more inventive "tortures" such as tickling or orgasm denial may also feature heavily.
- No More Torture - a 5 minute slideshow set to music with information on extraordinary rendition and torture used at Guantanamo Bay
- Interrogation techniques from GlobalSecurity.org
- Taped and Electronically Recorded Interrogation Resources and Training
- Excerpts from Harper's of CIA's Human Resource Exploitation Training Manual--1983