Psychopathy is forever stereotyped with psychology. When I tell people I am studying psychology they immediately make a crack about "crazy." I've come to realize that few people make a distinction between psychosis and psychopathy. The two disorders could not be any different.
There has been a recent hub-bub with academics in relation to Dr. Hare's PCL-R test, which is one of the only scientifically backed assessment tests of psychopathy. Virtually all psychiatric and social intake workers are familiar with this test (a checklist actually) and it sets serious legal ramifications with jury trials if you are found to be psychopathic.
In recent news this test has come under question and studies have shown the results are highly varied. There are several measures used to determine if a testing tool is "true" and high variability does not bode well for making that case.
Two psychologists tried to publish an opinion paper calling to light the merits of the PCL-R test and evaluating psychopathy on the whole. The study was accepted for publication in an APA journal and completed the peer review process. Shortly after this Dr. Hare threatened to sue the articles authors and the APA for defamation if the article was published. Open mouth, insert foot Dr. Hare? It's important to note that Dr. Hare receives royalties for this checklists use. There is a clear motivation for him to prevent academic freedom of speech and try to quash this paper. The bad news is that Dr. Hare succeeded in having the publication delayed. The good news is that regardless the cat is out of the bag and you can bet the PCL-R is going to be the subject of some much deeper analysis in the coming months.
Also of interest on psychopathy is this article from 1935 describing a psychopath caught by the police:
http://www.scribd.com/doc/32764874/Psychopaths