Lie Detector Technology: How the Polygraph Reshaped Police Investigations in the 20th Century
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YouTubeCrime Stories Today
Lie Detector Technology: How the Polygraph Reshaped Police Investigations in the 20th Century
The polygraph, often called a lie detector, was first developed during the early 20th century to provide law enforcement with a tool to detect deception beyond traditional interrogation tactics. By monitoring indicators such as heart rate, blood pressure, respiration, and skin conductivity, the polygraph sought to reveal stress caused by ...
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