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How Does a Polygraph Test Work?

How Does a Polygraph Test Work?

David Scroggins goes through the process of administrating a polygraph test and understanding the results.

Season 31 Episode 15 - Videos

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2:57
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Firefighters Recall Finding James Kohnle in Burning Home
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1:29
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What Happened to James Kohnle?
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3:11
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James Kohnle’s Son Reveals the Effects of His Father’s Death
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3:55
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What Sentencing Did Teresa Kohnle Receive?
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How Does a Polygraph Test Work?

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