Lie detectors: Do polygraph tests work?

The use of lie detectors is expanding within the UK criminal justice system despite concerns over their accuracy.

The answers people give could help determine whether or not they can see their children, or even land them back in jail.

Sky News reporter Henry Vaughan sets out to discover if you can cheat a polygraph test.

Read more here: https://news.sky.com/story/can-you-beat-a-lie-detector-uk-police-increasingly-using-polygraph-tests-heres-how-people-try-to-cheat-13056067

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