How to detect a liar?

Introduction to Detecting Lies:

The following techniques to telling if someone is lying are often used by police, and security experts. This knowledge is also useful for managers, employers, and for anyone to use in everyday situations where telling the truth from a lie can help prevent you from being a victim of fraud/scams and other deceptions.
Warning: Sometimes Ignorance is bliss; after gaining this knowledge, you may be hurt when it is obvious that someone is lying to you.

Signs of Deception:

• Physical expression will be limited and stiff, with few arm and hand movements. Hand, arm and leg movement are toward their own body the liar takes up less space.
• A person who is lying to you will avoid making eye contact.
• Hands touching their face, throat &,mouth. Touching or scratching the nose or behind their ear. Not likely to touch his chest/heart with an open hand.
Emotional Gestures & Contradiction
• Timing is off between emotions gestures/expression s and words. Example: Someone says “I love it!” when receiving a gift, and then smile after making that statement, rather then at the same time the statement is made.
• Gestures/expression s don’t match the verbal statement, such as frowning when saying “I love you.”
• Expressions are limited to mouth movements when someone is faking emotions (like happy, surprised, sad, awe, )instead of the whole face. For example; when someone smiles naturally their whole face is involved: jaw/cheek movement, eyes and forehead push down, etc

 
• A liar is uncomfortable facing his questioner/accuser and may turn his head or body away.  

Verbal Context and Content

•A statement with a contraction is more likely to be truthful ” I didn’t do it” instead of “I did not do it”
• Liars sometimes avoid “lying” by not making direct statements. They imply answers instead of denying something directly.
• The guilty person may speak more than natural, adding unnecessary details to convince you…. they are not comfortable with silence or pauses in the conversation.• A liar may leave out pronouns and speak in a monotonous tone. When a truthful statement is made the pronoun is emphasized as much or more than the rest of the words in a statement.
• Words may be garbled and spoken softly, and syntax and grammar may be off. In other
words, his sentences will likely be muddled rather than emphasized

Other signs of a lie

• Using humor or sarcasm to avoid a subject.

Final Notes:
Obviously, just because someone exhibits one or more of these signs does not make them a liar. The above behaviors should be compared to a persons base (normal) behavior whenever possible
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