A psychologist who works in the field of law and criminal behaviour. A forensic psychologist must be able to testify in court, thus requiring the ability to formulate psychological findings in appropriate legal language. Forensic psychologists are employed in a variety of settings, including academia, police, probation and social services. In the UK, most such psychologists work in the prison service. Forensic psychology consists of a number of sub-fields such as forensic neuropsychology, requiring knowledge of brain structures and functions as well as brain damage.