Allow me to dream. The ideal system (in a world that is less than ideal) would be that the NPA and Hawks are headed by people who have a vested interest in the failings of the ruling party and therefore more difficult to corrupt/bribe (think a mix of opposition parties like EFF/DA/UDM or public service organisations like OUTA/FUL/HSF). This would guarantee great energy and authority in these departments in pursuing corruption and fear on the part of the people in power as they would not be able to halt prosecution. As I said, allow me to dream.