Forensic psychology is the intersection between psychology and the justice system. It involves understanding criminal law in the relevant jurisdictions in order to be able to interact appropriately with judges, attorneys and other legal professionals. An important aspect of forensic psychology is the ability to testify in court, reformulating psychological findings into the legal language of the courtroom, providing information to legal personnel in a way that can be understood. Further, in order to be a credible witness, for example in the United States, the forensic psychologist must understand the philosophy, rules and standards of the American judicial system. Primary is an understanding of the adversarial system. There are also rules about hearsay evidence and most importantly, the exclusionary rule. Lack of a firm grasp of these procedures will result in the forensic psychologist losing credibility in the courtroom. A forensic psychologist can be trained in clinical, social, organizational or any other branch of psychology. In the United States, the salient issue is the designation by the court as an expert witness by training, experience or both by the judge. Generally, a forensic psychologist is designated as an expert in a particular jurisdiction. The number of jurisdictions in which a forensic psychologist qualifies as an expert increases with experience and reputation. Forensic neuropsychologists are generally asked to appear as expert witnesses in court to discuss cases that involves issues with the brain or brain damage. They also deal with issues of whether a person is legally competent enough to stand trial.
According to R.J. Gregory in Psychological Testing: History, Principles, and Application, the main roles of a psychologist in the court system are eight-fold:
- Evaluation of possible malingering
- Assessment of mental state for insanity plea
- Competency to stand trial
- Prediction of violence and assessment of risk
- Evaluation of child custody in divorce
- Assessment of personal injury
- Interpretation of polygraph data
- Specialized forensic personality assessment
Questions asked by the court of a forensic psychologist are generally not questions regarding psychology but are legal questions and the response must be in language the court understands. For example, a forensic psychologist is frequently appointed by the court to assess a defendant's competency to stand trial. The court also frequently appoints a forensic psychologist to assess the state of mind of the defendant at the time of the offense. This is referred to as an evaluation of the defendant's sanity or insanity (which relates to criminal responsibility) at the time of the offense. These are not primarily psychological questions but rather legal ones. Thus, a forensic psychologist must be able to translate psychological information into a legal framework.
Forensic psychologists provide sentencing recommendations, treatment recommendations, and any other information the judge requests, such as information regarding mitigating factors, assessment of future risk, and evaluation of witness credibility. Forensic psychology also involves training and evaluating police or other law enforcement personnel, providing law enforcement with criminal profiles and in other ways working with police departments. Forensic psychologists work both with the Public Defender, the States Attorney, and private attorneys. Forensic psychologists may also help with jury selection.
Read more about Forensic Psychology: Distinction Between Forensic and Therapeutic Evaluation, Forensic Psychology Practice
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