Tue Mar 11 10:15:23 UTC 2025: ## Lie Detector Test: A Century of Questionable Accuracy
**Chennai, March 11, 2025** – The polygraph, or lie detector test, a tool used in police interrogations for nearly a century, has been deemed ineffective and unreliable by the scientific community, according to a recent article in *The Hindu*.
First developed in 1921 by John Larson, a medical student, and a police officer, the device measures physiological responses like blood pressure, pulse, respiration, and perspiration to assess truthfulness. While the polygraph has been used since 1924, it has never gained acceptance as legal evidence in courtrooms. The article explains that the device works by detecting deviations from “normal” physiological patterns during questioning, deviations once believed to indicate deception.
However, *The Hindu* highlights the scientific consensus that these physiological changes are not reliable indicators of lying and that the test can be easily manipulated. Despite its long history, the polygraph remains a controversial and inaccurate method of determining truthfulness.
First Piper 