When someone lies to you they are more likely to:

1. Touch their face or scratch their nose
2. Blink more often than usual
3. Avoid eye contact
4. Smile only with their mouth
5. Seem uncomfortable with pauses in conversation and jump in to fill the gap
6. Provide more information  than  they are asked for
7. Look relieved when the subject changes
8. Have closed body language like crossed arms or have something between you