Wrong. "The United States Attorney is the representative not of an ordinary party to a controversy, but of a sovereignty whose obligation to govern impartially is as compelling as its obligation to govern at all; and whose interest, therefore, in a criminal prosecution is not that it shall win a case, but that justice shall be done." -- Berger v. United States, 295 U.S. 78, 88 (1935)

http://scholar.google.com/scholar_case?case=5318644154387676...