How to spot a liar

liespotter - a person who has the ability to spot a lie

Thanks to this TED talk I am now a better liespotter.
My mum is an excellent liespotter, she always knows when I'm trying to hide the truth.


telltale - a sign, indication of something

That clue was a serious telltale so I knew right away what was going on.
Body language can be a telltale to spot a lie.

duping delight - being actually pleased with commited crime

Psychopats often smile when confessing their crimes, showing the duping delight.
A woman was smiling in duping delight evem though she killed her husband a few hours ago.

veracity - truthfullness, honesty

Veracity of those emotions was confirmed by her crying.
You seem to be lying, I don't believe in veracity of what you're saying.