Why Lie Detector Tests Can’t Be Trusted

Re:Why Lie Detector Tests Can’t Be Trusted by jpmattia on Monday July 29, 2019 @02:45PM (#20557914)

> Trying to keep a random number secret likely is less stressful than an actual lie.

Which begs the issue: If a lie detector is accurate only for answers that are stressful, then it sure looks like we need a detector to figure out if an answer is stressful or not.

Or to put it differently, now you have two problems: Lie detection and stressful-answer detection.

Nevertheless, I concede that your beer detection plan is superior.

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Re:Why Lie Detector Tests Can’t Be Trusted by johnfactorial on Monday July 29, 2019 @05:36PM (#20559698)

Indeed it occurred to me when I took my LDTs that the test's basic premise is: our machine detects stress responses, and our questioner assumes repeated stress coincident with the same answer equates to a lie. Stated outright like that, everyone can see the assumption behind the test is obviously, irredeemably flawed.

Therefore I too must concede that the beer plan is flawless.

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