About Bihar Police :
Bihar Police comes under direct control of Department of Home Affairs, Government of Bihar. The Bihar Police is headed by a Director General of Police (DGP; three-star rank). The state is divided into four zones (Patna, Muzaffarpur, Darbhanga and Bhagalpur), each commanded by an Additional Director General (Addl. DGP; three-star rank) or an Inspector-General (IGP; two-star rank). Each zone is divided into two to three ranges, each commanded by a Deputy Inspector-General (DIGP; one-star rank). Within each range are anywhere from three to six districts, each under a Superintendent of Police. Patna is under a Senior Superintendent of Police.