How Police Interrogation Works…
Are You A Perp?… A Potential Perp?… Read … Learn… Practice.
There are “Law & Order” addicts everywhere who think they could get a perp to confess. A little glaring, some getting in the guy’s face, a revelation that his fingerprints are all over the murder weapon and voilà! He’s recounting his crime. In real life, police interrogation requires more than confidence and creativity (although those qualities do help) — interrogators are highly trained in the psychological tactics of social influence.
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http://people.howstuffworks.com/police-interrogation.htm/printable