But there's also some evidence that there are certain people who can reliably detect lies from any source at least 80% of the time without any previous training: microexpressions expert Paul Ekman calls them (sigh...I can't believe I have to write this) Truth Wizards, and identifies them at about one in four hundred people.

I have a Scientific American that claims this has turned out to be false. I'll try to find it and post back.