If you're interested in what life for such a person is like (or if you might be one!), check out M. E. Thomas's Confessions of a Sociopath . I wrote about it here: http://jseliger.wordpress.com/2013/08/08/summary-judgment-co... and Tyler Cowen wrote about it here: http://marginalrevolution.com/marginalrevolution/2013/06/con... and elsewhere. FWIW, from what I've read ( http://www.newyorker.com/reporting/2008/11/10/08…
You might also want to note that there are many different versions of [staying] out of trouble .
researchers could study only the psychopaths’ behavior, in most cases through their criminal records
It's a fascinating disorder, really, in that the most severe cases are difficult to detect so long as they do not make mistakes.