[hollerith]

What court has admitted polygraph test results into evidence? Surely, none in the US.

[callalex]

I suspect we have different definitions of “legal system” in mind. You are correct that such things cannot be admitted as evidence into a court case, but law enforcement agencies still use the machines and do their best to lie to unknowing victims that it will be admitted to court.

[randombits0]

They are often used in pre-employment screening for sensitive government jobs. Yes, it would be illegal for a private employer to do this.