In order to catch someone in a lie, you must pay close attention to the details in their story, compare their behavior to their baseline temperament (how they act when they’re comfortable) and most importantly you must ask yourself, “Do I really want to know the truth?” According to Robert Feldman, a professor of psychology at the University of Massachusetts, one reason liars often succeed in deceiving someone is because on some level, the other party wants to remain in the dark. But, if you think you can handle the truth, check out our slideshow to learn how to spot deception like a pro!