[mindfulhack]

Polygraphs are a joke for this reason among so many others: Psychopaths, sociopaths and narcissists can fool them because they are able to feel zero (or are incapable of feeling any) biological fear or anxiety (i.e. 'stress response'), while telling complete lies.

[XaoDaoCaoCao]

Which is a bit horrific when you realize they act as sieves promoting the hire of such people in a higher proportion than the general population. Polygraphs are worse than useless and mere jokes; they are selectors for a kakistocracy amongst the executive levels of American governance!

[everdrive]

Realistically, people who have to take them regularly can also learn to do “better” at them, as you can with any “test.”