Overcrowded prisons and the increase in diagnoses of mental illnesses, particularly personality disorders, related to criminal activity suggest that our society and criminal justice system need to reanalyze and modify psychological rehabilitation programs to effectively reduce and prevent crime. By analyzing specific aspects of prisons and personality disorders, we can objectively interpret information that can be used to improve the criminal justice system. Concepts such as the prevalence of personality disorders in prison communities; the relationships between some crimes and disorders, the idea of ​​institutionalization, as well as possible treatments within prisons will be examined. Furthermore, by understanding personality disorders associated with crime, more effective intervention programs can be initiated. According to the United States Federal Bureau of Prisons (2013), there are currently 217,862 people incarcerated. Of that total population, 93.3% are men while the remaining 6.7% are women. The current prison population ranges from 39 to 51% of assigned capacity (James, 2013). The results of prison overcrowding are seen through increased taxes, reduced staff-to-inmate ratios, and the inability to maintain the facilities that house these inmates (James, 2013). Researchers have also determined a correlation between inmate misconduct and overcrowding, adding to the list of negative effects (James, 2013). Along with the rising prison population rate, diagnoses of mental illnesses, particularly personality disorders, have also increased. The CDC reported in 2011 that at least 25% of US adults have a mental illness and approximately 20% of US adolescents have a diagnosable mental disorder... half of the paper... ce, 35(4), 389-396Rutherford , H., & Taylor, P. J. (2004). The transfer of female criminals with mental disorders from prison to hospital. Journal of Forensic Psychiatry and Psychology, 15(1), 108-123. Saradjian, J., Murphy, N., & McVey, D. (2013). Providing effective therapeutic interventions for men with severe personality disorders within a high-security prison. Psychology, crime and law, 19(5-6), 433-447. doi:10.1080/1068316X.2013.758972Sansone, R. A., & Sansone, L. A. (2009). Borderline personality and crime. Psychiatry, 6(10), 16-20. Steiner B., Wooldredge J. (2008). Inmate and environmental effects on violations of prison rules Criminal Justice and Behavior, 35(4), 438-456. Wogan, M., & Mackenzie, M. (2002). Antisocial personality disorder in a sample of sex-free, non-arson incarcerated adult male offenders. Offender Rehabilitation Journal, 35(2), 31-47