How can you tell when someone's lying?

Although it’s not an exact science, there are a few facial expressions and reactions that could indicate when someone is lying, according to FBI agent Mark Bouton. These giveaways include:

• Eyes darting back and forth
• Rapid blinking
• Closing their eyes for more than a second
• Looking directly to the right, up and to the right, or down and to the right
• Fake smile
• Touching their face
• Pursing their lips
• Sweating or blushing
• Shaking their head