"Your responsibility in your several districts for law enforcement and for its methods cannot be wholly surrendered to Washington, and ought not to be assumed by a centralized department of justice. It is an unusual and rare instance in which the local district attorney should be superseded in the handling of litigation, except where be requests help of Washington. It is also clear that with his knowledge of local sentiment and opinion, his contact with and intimate knowledge of the views of the court, and his acquaintance with the feelings of the group from which jurors are drawn, it is an unusual case in which his judgment should be overruled. Experience, however, has demonstrated that some measure of centralized control is necessary. In the absence of it different district attorneys were striving for different interpretations or applications of an act, or were pursuing different conceptions of policy. Also, to put it mildly, there were differences in the degree of diligence and zeal in different districts. To promote uniformity of policy and action, to establish some standards of performance, and to make available specialized help, some degree of centralized administration was found necessary."