Transitional justice and security sector reform are critical in post-conflict settings, particularly regarding the reform of judicial systems, intelligence services, police, correctional systems, the military, and addressing systemic massive human rights abuses committed by individuals representing these institutions. Accordingly, the relationship between security sector reform and transitional justice mechanisms, such as vetting, the representation of ethnic minorities in key institutions, the resettlement and reintegration of the former combatants deserve special attention from scholars. This article presents a comparative analysis of the reform of police and security forces in Kosovo, and explores the causes of different outcomes of these two processes.