The criminal mind. A common personality assessment when screening police applicants is the MMPI. There have been many articles written about the political personality types of the police. Most are often involved with substance abuse including drugs or alcohol. They determine what happens to the police work and of other investigative agencies in CJS and effectively they determine the workload of the courts. Criminal psychologists, however, especially those specializing in criminal profiling, may come from a law enforcement background instead of psychology. Peer influence often persuades the individual to engage in criminal behavior. The Journal of Police and Criminal Psychology presents peer-reviewed reports and research findings covering the theory, practice and application of psychological principles in criminal justice, particularly law enforcement, courts, and corrections. Police officers protect lives and property. Partly, this is due to a stubborn aversion to the notion that normal, regular people rape, murder, or molest children (Barlow, 1990). In fact, as noted by the Society for Police and Criminal Psychology, most criminal profilers are police officers trained in criminal profiling by the FBI or their police department. In one recent study, scientists examined 21 people with antisocial personality disorder – a condition that characterizes many convicted criminals. Detectives and criminal investigators, who are sometimes called agents or special agents, gather facts and collect evidence of crimes.. Duties. Personal interactions with police officers and the criminal justice system can influence favorability toward law enforcement. Police officers, detectives, and criminal investigators typically do the following: This test may find possible abnormalities in a person's personality, which could suggest unfitness for law enforcement. criminal justice system. They will also typically present with a lack of pro-social community involvement. For example, a police detective analyzes a crime scene, investigates the personal history of the victim, considers motivating factors, links the nature of the crime with similar behaviors of criminals, and finally generates a hypothesis about the suspect’s sex, age, race, education, marital status, personality, and other personal characteristics. In criminal justice system the decision made by the CPS and has a huge impact on everybody experiencing the Criminal Justice System (CJS) whether they are witnesses, victims or defendants. Criminal Peers: Individuals with this trait often have peers that are associated with criminal activities. Only insofar as they are humans, if you are to ask without further specificity. The search for the criminal personality or super trait has captured both the minds and imaginations of academics and the wider community (Caspi et al., 1994). Criminal populations have also been studied with the MMPI. Many times One of the most influential is the 1972 work, The Police Personality: Fact or Fiction by Robert Balch.