Suspects and Witnesses: Part IV Use of Polygraph in Investigations

Suspects and Witnesses: Part IV Use of Polygraph in Investigations

Suspects and Witnesses: Part IV Use of Polygraph in Investigations


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0h 26m 1947 HD

Watch suspects and witnesses: part iv use of polygraph in investigations soap2day. 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.

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