The creation of a police state in the seventeenth century gave rise to discussion about the science of police. To date, there is a discussion on the pertinence of the existence of a studies of the police, and as a consequence of the existence of an appropriate research methodology. Despite many scientific debates and more, and scientific studies, may indicate the existence of a whole branch of science closely related to the operation, organization and functioning of the police. In particular, are conducted: studies on the psychological profiles the candidates themselves to the police and also of criminals, sociological studies, which allow a summary of statistics on crime. An important direction of research is ethical matters. As a result, gradually shaping the knowledge and science of police, in conjunction with already existing and well-developed fields of science, which have their own methods