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Lie detectors can’t determine the truth. They can only tell if you’re nervous about something. They monitor heart rate, breathing, skin temperature and perspiration levels. They can see when these factors change when asked specific questions, which may indicate that you are lying…but it’s really a matter of the kinds of questions they ask, and how your reactions are interpreted. They are not considered reliable.

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MTK@lemmy.world ⁨1⁩ ⁨week⁩ ago
This. They measure these body changes and some idiots decided that these correlate perfectly with lies, but really they can correlate with plenty of things. They start with a base measurement where they ask you simple and verifiable questions such as your name, address, etc.

Here are some legitimate reasons that can get you marked as a liar:

Getting nervous because you are being investigated.

An accusatory question gets you nervous

Panic attack

Physical discomfort, can be because of a long investigation.

A question agitates you

And more

A polygraph can be useful to help uncover the truth as it can help investigators possibly find subjects that disturb you and could relate to lies.

Calling a polygraph a lie detector is ignorant, malicious, stupid, or some combination of the above.
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