For those who don't appreciate exactly what psychopath means, see http://www.hare.org/links/saturday.html
That's not exactly a scientific publication either, but it is not as if he wrote it himself.
Especially the bits about the fact that it's not a disease per se but more of a natural variation and the fact that it occurs as much as 1% of the time are quite something to absorb.
The first implies that there is no cure, the second that you probably know at least a few of them, even if they're of the 'subclinical' (according to the article) variety.
I think I've worked for one.