Warning: this is a deeply disturbing piece.
I’ve always had a dark fascination with psychopathy. Working in finance as long as I have, I’ve known more than my share of sociopaths; it’s practically a requirement for upper management on Wall Street. But psychopathy is something entirely different. I’ve only known one psychopath in my life that I can be sure of, and the fact that he’s still out there (and a cop, no less) disturbs me to this day.
This article goes into the things that separate psychopaths from the rest of us and, again, it is deeply messed up. Definitely worth the read, though.