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In this video, Dan Ribicoff, a private investigator and polygraph examiner, and Joel Writer, a physiology instructor for aspiring polygraph examiners, discuss the nature of lie detection. They emphasize that while many can lie convincingly, the brain may reveal the truth through physiological responses. The polygraph, commonly known as the lie detector, is extensively utilized by agencies like the NSA, CIA, and FBI, rooted in the detection of fear associated with truth exposure. They clarify that the term "lie detector" is misleading, as no such device can definitively prove truthfulness. Instead, the polygraph assesses body responses to various questions to gauge the likelihood of deception.