How to detect a liar?

This is very interesting! Still remember when I attended a few days Psychology training nominated by my company. We were taught about eye moments and nose touching.. My Lecturer said when a person lies, usually they will rub or touch their nose every mins.. hehehe... How to detect a liar? How to catch a liar without high tech equipment such as a lie detector? You need a good eye, good ear and a healthy skepticism.

• People tend to touch their nose and scratch their face when they lie.
• Follow their eyes, liar then to blink a lot and cannot maintain eye contact.
• Check their smile, people who are telling the truth tend to use many facial
  muscle but liar just smile with their mouth.
• Pay attention to details, liar tend to provide more information that necessary,
  they are being overly specific when they are making things up.
• Change conversation subject, if they are over relief then it is a sign of lying.

Watch the video for more tips.Liars are everywhere and the information gained might be useful in our daily conversation with friends and strangers. According to JuriSense on touching the nose:
When Bill Clinton testified about his affair with Monica Lewinsky, he touched his nose every four minutes when lying, but rarely touches his nose when telling the truth. Blood pressure goes up when a person lies and otherwise feels anxious, angry or upset, which causes a tingling in the nose. People will often lightly touch the underside of their nose, by the nostrils, to satisfy this itch. This touching is quicker and gentler than the more deliberate, vigorous, repetitive rub to satisfy a typical itchy nose. It may occur several minutes after the lie, when the attorney is speaking with another juror.