Human Lie Detectors: How to Know if Someone is Lying to You

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The techniques used by government agencies and police to detect deception during interrogation could just as easily be put to use in relationships and business situations. It is helpful if you have some knowledge of what is normal for the person in question when attempting to read their body language and facial reactions for cues.

  1. Expression and movement is stiff. Liars use smaller hand gestures and take up less space than those who tell the truth.
  2. Deceitful people will very often touch the lower part of their face (scratching nose, touching their mouth, etc.) This appears to be instinctive as children will sometimes cover their mouth after a lie. Through time the movements evolve into more subtle cues.
  3. Dishonest people will tend to look around a lot to avoid looking you in the eye. Staring intensely in your eyes can also be indicative of deceit. Liars have often done their homework and are trying to minimize their eye movement by looking directly into your eyes.
  4. When a lie is told, the body releases adrenalin which will cause the pupils to dilate.
  5. Liars will often stand slightly to the side of their accuser or with the shoulders slightly turned. This is because they feel uncomfortable standing directly in front of an accuser.
  6. You can tell if a person’s smile is genuine by noticing which muscles are used. Liars often limit their facial expressions to the mouth, whereas a genuine smile involves many muscles in the face.
  7. Another instinctive behavior that is indicative of deception is the tendency to try to hide the palms of the hands. Look for holding hands behind the back or hands in the pockets.
  8. Liars will attempt to add unnecessary detail in an effort to convince the other person
  9. Many times, a dishonest person will be difficult to understand and sometimes they use incorrect grammar. The liars brain is moving so fast to search for an answer that the signals are sent to the mouth incorrectly.
  10. Liars will mirror your own words to answer your questions.
  11. A dishonest person’s tone of voice is often not consistent with what they are saying.
  12. Liars play with objects (bracelet, hair, ring, pens, etc.). They also put objects between you and them, in a subconscious attempt to hide put a barricade between you.
  13. Sarcasm is a common trait among dishonest people when answering accusations.

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