Mind of a serial killer: Why one in every 150 people is a psychopath

What triggers a serial killer? How do serial killers think? Are serial killers born or made?

Global News speaks to psychological experts to answer those questions and go inside the minds of the world's most notorious killers to explore what leads them to commit their heinous murders.

Jeff Semple finds out how experts are studying the mentality of psychopaths in an effort to prevent mass murders and what MRIs are revealing about the gray matter and formations of serial killer's brains.

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