Can Cops Catch Liars?

If it is true that most people are unable to detect deception, what does that say about the accuracy of police investigators?   

So you want to be a professional lie detector?

A variety of professionals (police, lawyers, therapist, dispute mediators, arbitrators, behavioral researchers) require lie-detection skills or knowledge to do their jobs, but they are paid to do their total job. Lie detection is just part of it.

Micro Expressions and a Good Liar

Micro expressions tell us what a person is feeling, but not why they are feeling it. Interpreting the emotions of others, knowing why they are feeling what they are feeling, is necessary for accurate lie detection.