How to Catch a Liar:


#5 Do not use eye contact or lack of it as a sole indicator of truthfulness. 
Contrary to popular belief, a liar does not always avoid eye contact. Humans naturally break eye contact and look at non-moving objects to help them focus and remember. Liars may deliberately make eye contact to seem more sincere; this can be practiced to overcome any discomfort, as a way of "proving" that truth is being told. Indeed, it has been shown that some liars tend to ''increase'' the level of eye contact in response to the fact that investigators have often considered eye contact as a tell. Clearly, only use eye aversion as one indicator in a general context of increasing distress when being asked difficult questions.


#2 Look for nose touching and mouth covering. 
People tend to touch the nose more when lying and a great deal less when telling the truth.  A lying person is more likely to cover his or her mouth with a hand or to place the hands near the mouth, almost as if to cover the lies coming forth.


#1 Look for micro-expressions. 
Micro-expressions are facial expressions that flash on a person's face for a fraction of a second and reveal the person's true emotion underneath their facade. Some people may be naturally sensitive to them, but almost anybody can easily train to be able to detect micro-expressions. Typically, in a person who is lying, his or her micro-expression will exhibit the emotion of distress, characterized by the eyebrows being drawn upwards towards the middle of the forehead, thus sometimes causing short lines to appear across the forehead skin.
 

#7 Observe the level of mirroring. 
We naturally mirror the behavior of others with whom we're interacting; it's a way of establishing rapport and showing interest. When lying, mirroring may drop as the liar spends a lot of effort on creating another reality for the listener. Some examples of failed mirroring that might alert you that something's not right include:


#4 Watch the eyelids. 
These tend to close longer than the usual blink when a person sees or hears something he or she doesn't agree with. However, this can be a very minute change, so you will need to know how the person blinks normally during a non-stressful situation for accurate comparison. If the hands or fingers also go to the eyes, this may be another indicator of trying to "block out" the truth.


#10 Check breathing. 
A liar tends to breathe faster, displaying a series of short breaths followed by one deep breath. The mouth may appear dry (causing much throat clearing).
 

#3 Notice the person's eye movements. 
You can usually tell if a person is remembering something or making something up based on eye movements. When people remember details, their eyes move to the right (your right). When people make something up, their eyes move to the left. People also tend to blink more rapidly ("eye flutter") as they're telling a lie. More common in men than in women, another tell of a lie can be rubbing the eyes.


#6 Watch when the person nods. 
If the head is nodding or shaking in opposition to what is being said, this can be a tell. For example, a person might say that he or she did something, such as "I cleaned those pots thoroughly" while shaking the head, revealing the truth that the pots were wiped briefly but not scrubbed. Unless a person is trained well, this is an easy unconscious mistake to make and such a physical response is often the truthful one. Also, a person may hesitate before nodding when giving an answer. A truthful person tends to nod in support of a statement or answer ''at the same time'' it is being given; when someone is trying to deceive, a delay may occur.


#9 Watch the person's throat. 
A person may constantly be trying to lubricate their throat when they lie by swallowing, gulping or clearing their throat to relieve the tension built up.


#8 Leaning away. 
When a person is telling the truth or has nothing to hide, he or she tends to lean toward the listener. On the other hand, a liar will be more likely to lean backward, a sign of not wanting to impart more information than is necessary. Leaning away can also mean dislike or disinterest.