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The "blue sense" is a cop's intuition about impending danger, about whether a suspect is guilty, about whether someone's lying, about hunches regarding cases or people. The term is used by Lyons and Truzzi to refer to something akin to psychic power possessed by good cops. "It is that unknown quantity in the policeman's decision-making process that goes beyond what he can see and hear and smell." (Lyons and Truzzi, p. 11)
Studies have not validated the "blue sense," but there is good evidence that some people, including some cops, reliably infer others' emotions, intentions, and thoughts by their demeanor and facial expressions (Eckman and Friesen1975; Eckman and Rosenberg 1979).
See also psychic detective.
Ekman, Paul and Wallace V. Friesen.1975. Unmasking the Face; a Guide to Recognizing Emotions from Facial Clues. Prentice-Hall.
Gladwell, Malcolm. 2002. “The Naked Face.” The New Yorker. Aug. 5.