Lie Detector

Lead: Its advocates claim it can solve one of mankind’s great longings, the desire to know when a person is telling the truth, but the lie detector remains a controversial and constantly questioned tool in the fields of law enforcement, business, and national security.

Intro.: A Moment in Time with Dan Roberts.

Content: The basic premise of a lie detector is that there is direct connection between physiological phenomena — heart rate, blood pressure, respiration, even perspiration — and intellectual response, specifically deception. While others had experimented in this field prior to 1917, many credit William Marston, a Harvard-trained lawyer and graduate student, as the inventor of the lie detector. He was certainly the earliest and foremost promoter of the techniques and technology of the polygraph, yet his unqualified and untempered enthusiasm and showmanship brought the so-called science of lie detection into question.