FiveThirtyEight
Nate Silver

Maggie Koerth

Again, polygraphs really are not reliable in testing truth-telling or lack thereof. All they really detect is anxiety, which can mean any number of things. But they are used all the time by law enforcement. And, far as anyone can tell, that continued use in spite of the evidence is basically magical thinking.

Nathaniel Rakich

As Maggie said earlier, polygraph tests are not particularly reliable. Maybe Mitchell is focusing on it because of the public perception that they are reliable? Otherwise, I’m not sure why she’s dwelling on this.


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