You can't really evaluate your ability to detect lies accurately, because you can't count the times someone was lying and you didn't notice it. You also probabl

You can't really evaluate your ability to detect lies accurately, because you can't count the times someone was lying and you didn't notice it. You also probably can't count the times you thought someone was lying but wasn't (people can look like they're lying when admitting something that makes them uncomfortable, or hiding something while still telling the truth), since you probably didn't prove every single case. So you have an unknown rate of false positives and an unknown rate of false negatives. The gut feeling/discrepancy you notice in body language can only be used as a sign you should dig deeper. Just like a polygraph, it can't prove someone is lying or not. You have to cross-reference.