Violent offender research and implications for the criminal justice system.

Some offenders are at very high risk to reoffend. Research conducted at the author's institution and elsewhere shows that psychopathic offenders are especially likely to be violent, that future violence can be predicted with considerable accuracy among men who have committed at least 1 violent offense, and that treatment programs to reduce dangerousness do not always have the intended effects (i.e., they may actually increase the dangerousness of some individuals). Implications for the criminal justice system pertain to release following insanity acquittal, offender sentencing and parole, preventive detention, offender treatment, and program evaluation.