It sounds as suspect as every other lie detector test, but psychologists have used thermography, a technique based on determining body temperature, to determine if someone is telling the truth.

They say a person telling a lie has been shown to undergo a “Pinocchio effect” – their nose changes. But it does not grow, instead they can detect an increase in the temperature around the nose and in the orbital muscle in the inner corner of the eye. Plus, they say when people exert a considerable mental effort the face temperature drops – and the opposite happens during an anxiety attack. 

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