The government had installed a unified national system rather than a decentralized one under local control; England and Wales were divided into 31 areas based largely upon police authority areas, each with a headquarters. The structure of the headquarters and its accompanying legal services, field management, and support services are described. Under the CPS, cases are to be conducted vigorously, without delay, and without improper influence. Sufficiency and quality of evidence, staleness of the offense, penalties, and other considerations of independent prosecution to administer criminal law in the interests of justice are defined.