In studying criminal behavior, psychologists can play a great role. The psychologists focus on the motive and the causes behind the different of the criminals. Different theories and approaches of psychology often make it possible for the investigators and forensic psychologists to find out the motives and the basic tendencies of the people who are prone to criminal behavior or antisocial behavior. Often there are megalomaniac people who often commit heinous crimes and don’t even accept their crimes. On the other hand some claim to forget what they have done.