The conduct of a man like all we know, from remote times always has concerned students and it has always been from studies and reviews. Of there is what the schools intervene criminal legal, according to Jimenez de Asua. The term gives explanatory causes, regulations and applications come from study of the nature of human behavior. Human development and the origin of human fact are the subject of study of the explanatory, casual science and its unique limitation resides on your own radio of study. The behaviors that are based on or regulated in legal standards, are that studies normative science, and its field study is less than that of the explanatory casual science, why they don't pass of the regulatory framework? Lastly, we have applicable sciences which are a set of techniques that use the scientific material from which the other sciences contribute to help the development of the questions that in them they could be possible, so we have that criminology is an explanatory casual science, criminal law is a science normative and criminalistics is a science application.