I've dated a couple. Ahh the joys of dating-The most obvious traits of the psychopath are charisma, charm and a grandiose sense of self-worth, all somewhat positive traits. Many people actually like and are attracted to psychopaths whom they have just met, only to discover conning, manipulation and deceit—the dark side of this disorder—down the line.
Just go with her for 3 or 4 months. If you're still alive than she's not, but if you die, jokes on you
They don't have decapitated heads in bags inside their refrigerator :D
Lol a la Patrick Bateman style ;D
Start raping them and if they like it they're not a psychopath.