For many years, law enforcement and other officials have had problems with the criminals and inmates they control. People from all walks of life commit crimes. Some of these crimes are minor and insignificant, while others are gruesome and gruesome. Violent offenders and non-violent offenders have many similarities, but also some differences. One of the main differences is that 80% of the two million people incarcerated and incarcerated are men, and 80% of them are violent offenders (Lewis, 2010). This is the vast majority of offenders, and there are many more violent offenders than non-violent offenders. Which personality traits are more pronounced in violent offenders than in non-violent offenders? If there was a clear way to probe the mind of a violent offender, it would have been done by now. The interest in specifically identifying the personality traits of violent offenders is enormous. Research has shown that reduced central serotonin (5-HT) functioning is linked to impulsivity, aggression, and violent behavior (Retz, Retz-Junginger, Supprian, Thome, Rösler, 2004). This is important because if serotonin levels could be regulated, the level of aggression could be controlled. This would be very beneficial to the rehabilitation efforts of prisons and prison officials. Certain personality traits are quite obvious and common in a violent person. Things like aggression and impulsivity are obvious, but others may not be. Things like psychopathic tendencies, or even arrogant self-evaluation and feeling that the job is beneath them are also common. Among men who commit violent crimes, most meet the criteria for conduct disorder by age 10 and have antisocial tendencies (...... middle of article ......erry, MP (1992). , Bureau of Justice Fact Sheet, 1-4. Hodgins, Sheilagh (2007). . Behavioral Sciences and Law, 28(2), 224-234 doi:10.1002/bsl.929Retz, W., Retz-Junginger, P., Supprian, T., Thome, J. and Rösler, M. (2004). Association of serotonin transporter promoter gene polymorphism with violence: relationship to personality disorders, impulsivity and ADHD psychopathology in children..589