Republika Srpska ("RS") is a integral part of BIH, but they do have limited autonomy. For example, they have their own local police with some special support units ( SWAT teams). Similarly, the Federation ("FBIH") is the other integral part of BIH and they too have their own local police with special unites such as SWAT. Both entity police forces are government by the Directorate for Coordination of Police Bodies of Bosnia and Herzegovina, the aforementioned agency is on the national level with HQ in Sarajevo, it oversees all of the police unites in the country. Additionally, on the national level we have the Border Police of Bosnia & Herzegovina, we have the State Inspection and Protection Agency ("SIPA") and the Intelligence-Security Agency of BiH ("ISA/OSA") all have jurisdiction over the entire territory of BIH. The armed forces are on the national level as well.
Seems Serbs have three separate territories in the Balkans - Serbia, Srpska and they also claim Kosovo.