Or customs agents at airports! #BadExperiences. The article defines psychopathy as "characterized by shallow emotions (in particular reduced fear), stress tolerance, lacking empathy, coldheartedness, lacking guilt, egocentricity, superficial char, manipulativeness, irresponsibility, impulsivity and antisocial behaviors such as parasitic lifestyle and criminality."
So I guess that mere callousness/unpleasantness doesn't cut it