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1968, DEC 8 1968 Reproduction of A Section of A Polygraph (Lie Detector) Chart Made By A Denver Examiner Testing A Worker For A Local Company Saw-tooth line at the top is a record of the man's breathing. Wavy line in the middle is a record of his response to a slight electrical charge passing through the kin of his fingers. Heavy, up-down tracing at the bottom is a record of his pulse rate and relative blood pressure. Numbers identify the questions asked. Questions 2, 4, 7 and 9 were harmless, irrelevant questions, but questions 3,5,6 and 8 were considered key questions in the Arrows, added by Denver Post, indicate apparent sponses. Neither the man nor his employer was (Denver Post via Getty Images)