Lie detectors are a pretty cool sounding idea. But how valid are the results they produce? Should they be used more often, or sent to the junkyard? Laci looks for an honest, scientific answer.

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Can you REALLY detect a lie?
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"Can you REALLY tell if your friend is lying to you? As it turns out, probably not. James Williams isn't lying when he says deception is a tricky thing."

The curious story of how the lie detector came to be
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"The science behind the lie detector test has been disputed since its creation 90 years ago, so is there any reliable way to tell if someone is lying, asks Dr Geoff Bunn, author of The Truth Machine: A Social History of the Lie Detector."
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