It has been proven time and again that the polygraph doesn’t work.
That said, they are kinda brilliant.
Think about it. If you’re being subjected to a lie detector test, it means that the person using it on you believes it will work. Telling them that it’s an unreliable pseudoscience is exactly what they’d expect a liar to say, so you can’t say it without making yourself look dishonest. Saying nothing about the lie detector’s uselessness, on the other hand, implies that you believe it might work, which just lends credence to its eventual result.
After the test, if it says you were lying, saying that the test proves nothing just makes you look even more guilty. If, on the other hand, the test says you were telling the truth, you’re not going to tell them it’s wrong, so false findings of honesty never get contradicted.
The polygraph doesn’t work, but the logical conundrum that keeps it in use works all too well!
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