Twisted Killers
How Do Investigators Know When Someone Is Telling the Truth?
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How Do Investigators Know When Someone Is Telling the Truth?

Beth Karas explains her techniques in questioning suspects and how to catch them in a lie.

Season 1 Episode 4 - Videos

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2:15
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Police Attempt to Identify Other People in Brian Minton's Group
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1:32
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What Will Make a Gang Member "Crack"?
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1:10
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How Do Investigators Know When Someone Is Telling the Truth?

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