In the last decades, the participation of police contingents, better known as UNPOL, policing contributes to peace-building, capacity building at the level of local actors and, thus, to the stabilization of post-crisis regions. This article is based on interviews conducted with Canadian police officers deployed in the United Nations Mission for the Stabilization in Haiti (MINUSTAH) and focuses on what police work entails for frontline police officers working in contingent environments. We concentrate on both the organizational and operational impacts of such missions on police work. This micro-sociological approach reveals that peace operations are largely dependent on the modes and nature of interactions by local protagonists in their daily routines as they enforce the UN mandate.