How the Polygraph Reshaped Criminal Investigations in Mid-20th Century America
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How the Polygraph Reshaped Criminal Investigations in Mid-20th Century America
The polygraph, or lie detector, measures physiological indicators such as heart rate, blood pressure, and respiration to infer deception. Its development in the early 20th century offered investigators a new method to evaluate suspect and witness statements beyond traditional questioning. By the 1940s and 1950s, polygraph tests became ...
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