For the sake of administrative convenience, there may be one or more Additional Superintendents of Police and Deputy Superintendents of Police. The Superintendent of Police is incharge of the entire police force in the district and is responsible to the District Magistrate so far law and order problem is concerned.
However, in metropolitan cities of Bombay, Calcutta, Madras, Hyderabad etc., the powers of Superintendent of Police and those of District Magistrate are combined in one single official called the Police Commissioner.
The Constitution confers exclusive power on the States to control and regulate the functioning of the police as the maintenance of public order and police, including the railway and village police, are State subjects.
The Central Government is concerned only with the administration ‘of Central Police Reserve Force, the Border Security Force and the Central Industrial Security Force as also the Central Bureau of Intelligence & Investigation.
Though the Constitution of India enumerates police as a State subject in the List, it includes a long list of allied and quasi-police subjects in the Union List. For example preventive detention, arms, ammunition, explosives, extradition, pass-port etc. are the sole responsibility of the Central Government. It also determines the selection and service conditions of all India Police Services. The selection and conditions of service of lower ranks is within the power of the State Government.