Liars often pull their body inward when lying to make themselves feel smaller and less noticeable. Many people will become squirmy and sometimes conceal . - Liars tend to speak more than truthful people in an attempt to sound legitimate and win over their au.nce. They will also use more complex . - How to Detect a Liar. There have been many television shows sprouting up, based around how to tell if someone is lying. Here are a number of .Who hasn 't heard the old saying "Liars never look you in the eye"? close attention to hard-to-hide micro-expressions; these clues are often so difficult to detect .