How does it determine if somebody lied?
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Measures heart rate, sweat intensity, blood pressure and many other bodily functions.
In case you tell a lie the small change in these bodily functions would show up.
At least thats the theory, it isn't 100% accurate and isn't used besides movies anymore.
I had to take one once, and they're virtually impossible to beat. They attach a lot of clips and wires to your fingers and then ask you questions. Whenever you answer a question untruthfully, the indicators will show that on the page. Although they're still inadmissible in court, they are often used to screen potential job seekers.
It can register changes in a persons metabolic processes. Heart Rate, skin temp. , respiration and other measurable responses. The theory is that people's metabolisms change under stress and for most, lying puts the body under stress.
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