1. scratch there nose or throat area (they do this subconciously trying to hide the truth)
2. their pupils become smaller
3. a lot of fidgeting
4. when you completely change the subject they follow along (because they want to be as far away from being questioned) but if a person who IS telling the truth will be confused once you change the subject
5. they become defensive, and sometimes they cross their arms
6. They talk fast
7. Mispronouncing or mumbling.

Remember I ONLY HEARD ABOUT THIS..I haven’t tried it yet.
Also go to: http://www.blifaloo.com/info/lies.php it’s really interesting.