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They stare at you without blinking much Other signs to watch out for include sudden lip biting or pursed lips. "This occurs because the automatic nervous system decreases salivary flow during times of stress, which of course dries out the mucous membranes of the mouth."
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"If you ever watch the videotaped interrogation of a suspect who is guilty, you will often observe that it becomes more and more difficult for her to speak," writes Glass. The liar will get hostile because he is angry that you've discovered his lies, which may result in a lot of pointing. "When a liar becomes hostile or defensive, he is attempting to turn the tables on you," says Glass. "Liars often talk a lot because they are hoping that, with all their talking and seeming openness, others will believe them."
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"When someone goes on and on and gives you too much information - information that is not requested and especially an excess of details - there is a very high probability that he or she is not telling you the truth," writes Glass. Just look at their feet and you can tell a lot." "This is one of the key ways to detect a liar. It also shows you that he or she wants to leave the situation they want to walk away, she says. Shuffling feet tells you that the potential liar is uncomfortable and nervous. "This is the body taking over," Glass explains. "They are literally closing off communication." "When adults put their hands over their lips, it means they aren't revealing everything, and they just don't want to tell the truth," she says. "A telltale sign of lying is that a person will automatically put their hands over their mouth when they don't want to deal with an issue or answer a question," says Glass. "I never appreciated the potential use of this very telling behavior until I joined the FBI as a Special Agent," she says. I can always tell when someone's testimony has hit a nerve with the defendant, when I see his or her hand covering the front of his/her throat," says Glass. "I have often seen this in the courtroom when I work as a consultant for attorneys. This may include areas such as the throat, chest, neck, head, or abdomen. They instinctively cover vulnerable body parts The repetition is also a way to buy themselves time as they attempt to gather their thoughts, she adds. "They're trying to validate the lie in their mind." For example, he or she may say: "I didn't. This happens because they're trying to convince you, and themselves, of something, she says. So if you observe a rigid, catatonic stance devoid of movement, it is often a huge warning sign that something is off." "When you speak and engage in normal conversation, it is natural to move your body around in subtle, relaxed, and, for the most part, unconscious movements. "This may be a sign of the primitive neurological 'fight,' rather than the 'flight,' response, as the body positions and readies itself for possible confrontation," says Glass. It's common knowledge that people fidget when they get nervous, but Glass says that you should also watch out for people who are not moving at all. Your body experiences these types of changes when you're nervous and feeling tense - when you lie." "In essence, they are out of breath because their heart rate and blood flow change. When their breathing changes, their shoulders will rise and their voice may get shallow, she adds. When someone is lying to you, they may begin to breathe heavily, Glass says. This will often happen right before the person is expected to respond to a question. "The head will be retracted or jerked back, bowed down, or cocked or tilted to the side," writes Glass. If you see someone suddenly make a head movement when you ask them a direct question, they may be lying to you about something. They change their head position quickly Then you'll want to pay careful attention to their facial expressions, body language, and speech patterns, she writes in her book "The Body Language of Liars." Lillian Glass, a behavioral analyst and body language expert who has worked with the FBI on unmasking signals of deception, says when trying to figure out if someone is lying, you first need to understand how the person normally acts.