How Lie Detector Machine Works? Polygraph Explained...

Hello friends, In this video, I have told you about Polygraph or Lie Detector.You all must have heard about it but think that how it works? Lie detector is a controversial thing, people keep different perceptions about it. In some regions, Lie detector or Polygraph test is illegal also. I hope you will enjoy the video regarding Lie detector and polygraph test.

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