..psychology of a person who is lying........

It's very difficult to know that someone is lying...some people can lie very easily just like they tell truth.But you should be able to understand whether the person with whom you are talking is telling you the truth or he is lying..else you will be cheated by anyone easily....so ,to avoid that here are some tips to recognize such a type of people...
    Mainly knowledge of body language is very much important to notice that a person is lying..

• The person is quite confused while talking..when he/she is lying,he/she is thinking about excuses at the same time.It distracts his/her attention from the conversation..
• You will notice that the person avoids the eye contact.His /her eyes may be more frequently blinking or moving around the room.It indicates uncomfortable mental condition of the person...
• If you observe carefully the liar's body language,you will notice that it is like a form of self-protection(i.e we can notice some actions such as stepping back,tightening the knuckles etc)
•  Excessive friendliness can be the most important sign of lying..The liar wants to pretend that he/she is your true friend .so that you will start believing him/her....
• Sometimes ,the liar shows contradictory behavior...He/she wants to say 'no' ,but nods 'yes'...It is a type of subconscious movement...
• When a person tries to change the topic ,then this is also very important sign of a liar...
• If you ask them a question ,they will step on to the another question instead of responding to the question given to them directly....
• Liars mainly use over formal speech...i.e they even pretend to be over honest...
• They attempt to justify every detail with lengthy explanations...
• Repeats the protests of innocence....