Central Agencies List:
Central Armed Police Forces (CAPF) ->
Border Security Force (BSF), Central Industrial Security Force (CISF), Central Reserve Police Force (CRPF), Indo-Tibetan Border Police (ITBP), National Security Guards (NSG), Railway Protection Force (RPF), Special Protection Group (SPG) and Sashastra Seema Bal (SSB).
Central Investigation and Intelligence Institutions -> Central Bureau of Investigations (CBI), Directorate of Revenue Intelligence, Indian Income-tax Department, National Investigation Agency (NIA), Narcotics Control Bureau (NCB), Bureau of Police Research & Development (BPR&D) and National Crime Records Bureau (NCRB).
State Police Agencies List: District, Division wise Police Department, Criminal Investigation Department (CB-CID), Metropolitan police, Traffic Police, State Armed Police Forces
State Police Ranks -> Deputy Inspector General of Police (DIG), Superintendent of Police (SP), Assistant Commissioner of Police (ASI) or Deputy Superintendent of Police (DSP), Inspector, Sub-Inspector (SI) and Constable.