Suspects and Witnesses: Part IV Use of Polygraph in Investigations Trailer

Suspects and Witnesses: Part IV Use of Polygraph in Investigations Trailer (1947)

29 August 1947 Factual 26 mins

This short dramatized documentary film, presented by U.S. Army, introduces use of polygraph in investigation. Polygraph is used as a lie detector that measures blood pressures, pulse, respiration, skin conductivity while suspect is asked questions and answering them.

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International Releases Dates

United States 29 August 1947

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