Is it possible to fail a lie detector test when telling the truth?

5 Answers

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  • 3 months ago

    Lie detectors are not 100% accurate, so both false positives AND false negatives are possible.

  • 3 months ago

    Yeah, it's just as possible as passing one while lying. That's why they're only considered circumstantial evidence.

  • Robert
    Lv 7
    3 months ago

    It is.  But a good polygrapher will usually be able to determine when your nerves are effecting the test and when you are lying.  They use the machine results, and their observations, including interviews in their reports. 

  • Rick
    Lv 7
    3 months ago

    yep, sure is, IF you are the nervous type ....................

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  • Jesere
    Lv 7
    3 months ago

    It's not really a lie detector it's an emotion detector.  

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