This research focuses on the relationship between police-citizen in a community in peace process. In light of the ethnomethodological approach, we sought to investigate how organized knowledge around the police category guided the description that residents produce in relation to those who are members of what is called Pacification Police. Based on the concepts of membership category and membership categorization, we find that the police categorization process that operates in a Pacifying Police Unit (UPP) was held from what is provided by the common sense knowledge as activities tied to the police category. It is based on the description of rights and duties of the police that the residents build the meaning of a good and a bad police officer. The results also show that the categorization of the police is made by a contrastive process with other military sub-categories and even with the trafficker category. Through this process, it is clear that, for the residents, the new police model departs from the expectations of a police focused on the citizen and on the well-being of the community, which leads, in some cases, a reversal of the good guy category and trafficker category.