In recent years, there has been much controversy about the proper forum in which to prosecute and punish suspected terrorists. Some have endorsed aggressive use of military commissions; others have proposed an entirely new "national security court." However, as the nation strives for a vigorous and effective response to terrorism, we should not lose sight of the important tools that are already at our disposal, nor should we forget the costs and risks of seeking to break new ground by departing from established institutions and practices. As this White Paper shows, the existing criminal justice system has proved successful at handling a large number of important and challenging terrorism prosecutions over the past fifteen years-without sacrificing national security interests, rigorous standards of fairness and due process, or just punishment for those guilty of terrorism-related crimes.