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Explanation that’s far to long for the event.
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Difficulty looking you straight in the eyes. The eyes can glance downward or sideways.
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Sudden changes in facial expression that don’t match the situation.
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A facial expression such as a smile—that is held beyond a reasonable period of time. Most honest expressions last about five seconds, any longer they are likely to be contrived to deceive you.
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A false smile. When a smile is genuine, the skin below the eyes crinkles slightly and tiny wrinkles appear around the eyes. They can not be conjured up during a false smile. So watch the eyes not the smile.
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Halting speech patterns. These include long or frequent pauses, hesitation before the person answers a question, clearing of the throat or slight stuttering.
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Changes in voice tone and volume. “Telling a lie evokes unconscious anxiety, guilt and fear of getting caught. The brain transmits these to the voice, causing it to get higher and become louder and faster.
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Body signals could be perspiration on upper lip or around the face.
