One of the hallmarks of psychopathy is pathological lying. It is one of the indicators in the Hare Psychopathy Checklist (the gold standard of psychopathy). In the media and in tv, psychopaths are perceived as master manipulators. In the show Lie to Me (which I’m sure most of you are familiar with), Dr. Lightman has particular trouble reading psychopathic bad guys. However, some academic research* has suggested this is not so. In fact, one study found that compared to non-psychopathic criminals, psychopaths were perceived as less credible, were perceived as thinking harder, and overall were less successful at deception compared to non-psychopathic offenders (ratings were made by undergraduate students). This may be because psychopaths actually exhibit more of the red flags of deception than non-psychopathic criminals. For example, another study found that when psychopaths lie, they use more manipulators, lean forward more, and make longer eye contact compared to non-psychopathic offender lies.
This is not to say psychopaths are not still master manipulators. They are, but their skills at lying may be inflated and misleading.
Just thought you guys would like to know.
*sources available upon request