1.0 IntroductionCrime describes any act or omission prohibited by public law. Along the same lines, behavior is a function that exhibits measurable differences in the psychological characteristics of individuals (Brennan-Galvin, 2002). These characteristics may be influenced by constitutional attributes, personality, and neurophysiological or genetic factors. Likewise, criminal behavior is the commission of acts which, in their situational and social context, are considered crimes because they violate existing norms and codes of conduct, whether or not the perpetrator is arrested and tried, found guilty or acquitted. The origin of criminal behavior is complex since it involves a long-term interaction of psychological and biological characteristics, economic as well as social and cultural environments in which different individuals are born, raised and lived (Cassel and Bernstein, 2007). . In this context, this article will objectively discuss the theory of criminal behavior, why it should be studied, and the roles this theory plays in the criminal justice system. 2.0 Theory of Criminal Behavior The theory of criminal behavior is a set of principles and statements that attempt to explain how one or more factors lead to criminal acts. Additionally, the theory explains the response to a particular behavior and not the crime committed. Likewise, the phenomenon being studied occurs after a behavior has occurred and must be a reaction to the behavior in question. This therefore includes the fundamental decision of whether to use punishment as a means of control or to take into account that people should be blamed for their harmful actions. Any theory must be testable, so it must be stated in such a way that other people find themselves in the middle of paper.......criminal policies and programs while reinforcing existing ones. With its understanding of criminal behavior and various types of crime, the criminal justice system is better placed when it comes to preventing a particular type of crime and easily apprehending criminals with its ability to detect their next movement.5.0 ConclusionForming the research carried out, it is evident that there is no single theory capable of adequately providing all explanations relating to crime, because crime patterns involve several phenomena. It is important to note that although criminological theories attempt to explain the causes of criminal behavior, other measures, which are not necessarily theoretical, can be used to combat and reduce crime rates. Along the same lines, more research needs to be done to further reduce crime rates..