How to build a lie detector for under $20

Here’s a short video tutorial that will teach you how to make a cheap lie detector for under $20. Can anyone here confirm if “commercial” lie detectors also work that way?

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8 Responses to How to build a lie detector for under $20

  1. Nice one!

    so how to know if that person is lying?
    the sound pitch will get lower or higher?

    i’m a little confused.

  2. Nice one!

    so how to know if that person is lying?

    the sound pitch will get lower or higher?

    i'm a little confused.