The paper deals with the analysis of the relationship between work ethic and police internal control. In the first part of the paper, we will give a brief overview of the concept work ethic in correlation with the characteristics of police profession and organization. The second part of the paper will include an analysis of the relationship between work ethic and internal control in police. The basic thesis is that the efficiency of work (police) ethics reduces the need for internal control. The aim of this paper is to point out that work ethic is conditioned by the application of rules and Code of Ethics. The author concludes that the internalization of ethical principles, as well as the perception of punishing illicit and unethical behavior, creates work and social environment in which ethics is not understood as pressure but as a duty of an individual, social group and organization