> I would bet there will be two major populations of psychopath in solidly each category.
Those psychopaths who are "bad" at determining authenticity versus those who are "good" at it (mostly-wrong as opposed to mostly-correct, respectively)?
I'm hesitant to agree with that; from my understanding, a "psychopath" (current medical definition is Antisocial Personality Disorder, ASPD) is one who is outside of social norms and mores. Much like a precise machine, they are able to attenuate their focus to the nuances most neurotypical people take for granted.
Although far from a medical professional, I would hazard to guess an autistic person would be one of the groups you might attribute to supposed psychopathy (specifically: those unable to diagnose fake from authentic). However, even that claim should be taken with an ounce of salt. Point being, I get triggered when people use psychopath willy-nilly!