Here are three more tips to help you tell whether someone is lying or not:
1.) Liars’ voices tend to soften and get very quiet as they continue to tell their story. They are trying to hide their shame for the lie behind the story and are usually trying to make themselves feel better while lying. The falsely accused are usually frustrated angry about being interrogated when they are telling the truth!
2.) Watch for subtle body movements – they are usually telling the real story. A slight shoulder shrug usually indicates a lie like you would shrug if someone asked you a question you didn’t know the answer to. If the liar is smiling while telling you something that is sad or upsetting, they are trying to mask their own discomfort with a smile. Liars also sometimes indicate their true feelings with their heads – for instance, if someone is telling you that they agree with you but they are actually shaking their head.
3.) A smile can be very informative if you suspect someone is lying. Always watch to see if the liar is suppressing a smile – it could be indicative of what Dr Paul Ekman calls “duping delight” or the rush or joy that liars feel when their lies are believed and accepted.
The Work of Dr. Paul Ekman
Men’s Health, March 2012