Introduction Psychological theories attributed to different psychologists provide the schemes for apparent actions which are involved in the criminal processes and procedures. In the course of comprehending the diverse humanistic actions as well as behaviour involving their motives and directives, psychological theories serve as an essential resource tool. An example of instances where these theories serve as an indispensable tool is in the fathoming of the principles behind actions and in the appreciation of criminal behaviour. The rationality and exactness of these theories does vary with every factor that needs to be considered in a particular case. Since not every single theory can be accurately applied during criminal behaviour justification, it is crucial to appreciate the very fundamentals of these theories in order to draw rational and appropriate correlations. It is also important to note that the probability and validity of appropriateness of each theory application is considered before application in each crime in order to provide adequate predictability of the felonies. The possibility to explain and determine criminal behaviour scientifically has modified the field of criminology and inspired a vast number of studies in psychology. The unconventionalities of criminal behaviour are recurrent in the very blueprints of these psychological theories. It is in the critical analysis of these theories that we can elucidate interpersonal features of a crime, uncover possible behavioural action, and even foretell possible deviances (Vito, Maahs and Holmes, 2007, p .115). Logically, it is still not possible to prove the theories that correspond to criminal behaviour studies and consequently the correctness and relevancy of the theories vary in application depending on the strain of the situation, the individual, environmental factors, and other contributing forces (Semin & Fiedler, 1996). These psychological theories lay their focus on how attributes of a person may lead to criminal tendencies. Some of the theories mentioned herein include the behaviouristic, psychoanalytic, and neuropsychological theories. All these differ in their principles of applications as well as content of relevance in every criminal case scenario. However, every theory provides suitable side of rationale for the crime occurrence via psychological perspectives. Both the environment and personality influences on criminal behaviour are considered along with the mental processes that mediate the criminal behaviour. Since the primary determinants of human behaviour and mannerisms are innate, it is proper to state that the first few years of life; the environment plays an insignificant part in moulding behaviour (Elffers et al., 2004). The main body of this paper covers the relationship between drug abuse and crime by analyzing the different types of connections that exist between the two. In addition, the paper further elaborates on the psychology of criminal behaviour and then delves into the cognitive aspects of the link between criminal offenders and substance abuse. Substance Abuse and Crime Substance abuse is essentially a common recreational and exploratory practice the world over, especially among the