This chapter begins with an overview of police integration worldwide. Nearly 40 percent of modern peace agreements include police reforms, and the makeup of the police rank and file is often central to these reforms. Yet, despite the police’s central role in peace-building, existing literature on power sharing pays little attention to this critical institution. I argue that in divided societies, the police rank-and-file’s unique combination of three characteristics – visibility, discretion, and capacity for violence – makes it especially influential in shaping citizen–state relations. The second half of the chapter details causal mechanisms linking police integration with citizens’ attitudes and expectations. For example, language differences between officers and citizens may make citizens feel less comfortable communicating with officers, or citizens may fear that cultural differences will prevent officers from understanding their situation. When the police are integrated at the patrol-level, officers can monitor their colleagues’ treatment of coethnic citizens and deter bad behavior.