Like Patrick Bateman in American Psycho, psychopaths can be intelligent and charming, while hiding a lack of empathy . . .

The Hare Psychopathy Checklist-Revised (PCL-R) is used as a diagnostic tool to determine where someone lies on the psychopathy spectrum, as not all psychopaths display all the traits.

There are 20 items on the checklist, which score between zero and two points depending on whether someone matches a trait, to give a score out of 40.

In the UK, users are deemed psychopathic if they score above 25, but in the US it is 30.

Psychopaths display different traits depending on their disorder, but common signs include superficial charm, a grandiose notion of self-worth, the need for stimulation and impulsiveness, pathological lying, the ability to manipulate others and a lack of remorse and empathy. (Read more from “How to Spot a Psychopath: Expert Reveals the Traits to Look out for in Others and How to Tell If YOU Have the Personality Disorder” HERE)

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