Discover and read the best of Twitter Threads about #Polygraph

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For anyone wondering why introducing Polygraph or 'Lie-detector' tests into terrorist monitoring is a stupid thing to do, here's a quick explanation

They don't work. Because the brain and body don't function in ways that would allow them to work

/1
The premise of #Polygraph testing is that being dishonest, telling lies, causes a direct corresponding change in physiological levels in the body, like heart rate, skin conductance, muscle tension etc.

This is wrong, and has been shown to be wrong repeatedly

/2
Firstly, what's a lie? It can vary wildly from instance to instance. We lie to ourselves all the time. And many people wholeheartedly believe things which are objectively 100% false, so (subjectively) they're not lying when they say these completely wrong things

/3
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