Criminal psychologists study the intentions, wills, reactions, and thoughts of criminals, and all that is included in criminal behavior. They deeply study circumstances that would lead a person into crime and probable happenings after the crime. Criminal psychologists are called upon in courts to act as witnesses mainly to help the jury understand the criminal’s mind. The psychologists assess the physical and mental state of a suspect during the trial in order to typify him. He also answers psychological questions asked by the jury, which help in the final decision making. They are able to measure the sanity of an offender and conclude if the latter is fit or not to stand trial in court. The sanity can also be established at the time the offence was perpetrated (Bersoff, 2003).

Offenders who are not fit to stand trial have a right to seek medical attention, and only carry on when he is in a stable position. The question of whether a person is fit for trial depends on the current state of mind. An offender has to be checked for his ability to understand the charges made against him, the consequences of a conviction, and the ability to provide quality information to attorneys. The question of the probable sanity of an offender is assessed by checking the state of mind at the instance the offense is committed. Competence is checked in the offenders to identify the wrong and the right actions according to law. Insanity is hard to identify, and the defense is not common in court rooms. An insane offender has a right to be taken to a hospital facility, but for a longer time than their sentence (Ewing, 2006).

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