This thesis deals with the coproduction of knowledge and of policy in Brazilian public security. Among the main concepts about knowledge production, coproduction can be highlighted as a construct which argues that science frames and is framed by society. Based on this approach, this study draws upon the constructivist paradigm, which claims that reality cannot be taken for granted, instead it is created by the actions of several actors involved in any given process. The assumption of this thesis is that science is ubiquitous to all social environments. Hence, there are two ensuing questions: i) how the policy for knowledge production and diffusion is related to policy implementation, and ii) what are the relationships established between public security operators and knowledge production in this area; both relate to Brazilian public security. This study aims to identify and understand the factors that affect the systematization of knowledge production and dissemination focusing on sectorial policies. The object of analysis is the 'public debate' which crosses and/or is leveraged by the Brazilian Forum on Public Security. Observations of the Forum made possible the investigation of a heterogeneous inter-acting group of actors, including researchers, faculty members, third sector representatives and operators. We find that it has been created an explicitalbeit incipientscience policy dimension inside public security services, which in spite of some setbacks, manifested itself by: i) a tendency of a rise in schooling levels as an entry requirement, training and professional qualification, and ii) more recently, data collection and statistics production. The implicit element of science policy in public security brought antagonisms and synergy among different voices which establish symbolic and material negotiations for the molding of knowledge that will allow linkages between practice and theory. The data suggest that the success of this process will depend on elements such as interacting skills, trust building, the usefulness of the knowledge produced and reciprocity in acknowledging expertise in peers. Taking together, these elements have carved out present knowledge which shapes the competitors socio-technical imaginaries of how public security should be established in the future. This research has contributed to the understanding of important immaterial factors that affect the coproduction of synergy bridges between these heterogeneous epistemic communities, besides proposing a methodology for public policy studies.