As we listen our thoughts goes from the words to the old sentence "mmmh. Is this person lying to me or they are true words?"
It's never easy to find out when someone is lying to us, but we can learn a little from experience or from this webpage:
With simple words and images we can learn to identify a lying person with their gestures and expressions and even with his eyes movement during the talking in this other web:
This is one education we should all have learned, dont you think?
Good luck finding the cheaters!