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Sorry to burst your bubble but actaully, there is no such thing as a lie detector! What they use in jail is a machine that tells when your heart rate goes up. When you get nervous your heart pounds very fast, it basically detects that. So when you lie (unless you're a professional) your heart rate goes up and the machine detects it. You should use that!

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14y ago

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Q: How much is a lie dector test in UK?
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