I'd say that's a difficult assertion to prove in a system that provides every incentive for recidivism. In addition, how would you (or anyone else) fairly evaluate who falls into this category?

Or anyone else, for that matter. Tom Widiger, who served as head of research for DSM-IV, says "There are lots of studies which show that clinicians diagnose most of their patients with one particular disorder and really don't systematically assess for other disorders. They have a bias in reference to the disorder that they are especially interested in treating and believe that most of their patients have."

The reason should be obvious -- unlike medicine, psychological diagnoses rely on assessing symptoms, not the detection and treatment of causes.

Psychiatrists and psychologists who serve on parole boards have a record no better than chance. When they say that a person is no longer a threat and merits release, based on their accuracy and predictive track record, they might as well flip a coin.