How to Make a Simple Lie Detector
Lying can damage any relationship, and uncertainty can be equally destructive. It's tempting to spring into action and hook up the suspect party to a polygraph machine, but such tests can be exceedingly costly and time-consuming, not to mention unsubtle. While one can build their own polygraph machine (so long as they have knowledge of electronics), the simplest lie detector is human intuition. Honing your own skills makes it easy to suss out the lies from the truth.
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Instructions
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Acquaint yourself with the visible signs that someone is lying. The cheapest and most effective way to sniff out a liar is to pay attention to their body language and their voice when you are speaking to them. A shifting gaze, dilated pupils and refusal to look you straight in the eye are common signs that someone is hiding something from you. A rise in vocal pitch and several pauses while relating their story indicate can falsehoods as well. Be wary of stories coming from people who are tapping their feet, fidgeting and shifting, or changing color (blushing or blanching).
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Listen closely to what the person is telling you. Liars often have trouble with the details of their story, and may not be able to repeat them on second or third tellings. Someone who is lying to you may also implore you to accept what they are saying, quickly change the subject, or become extremely defensive.
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Observe changes in the subject's perspiration levels for the ultimate simple lie detector. Polygraph tests work by measuring the variance level of perspiration in the fingertips. You can achieve a similar affect by holding the person's hand while having a conversation with them. When the subject in question is brought up, you can observe any involuntary jerks or spasms, as well as whether or not their hands begin to sweat.
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References
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