Before September 11, we took it for granted that only nations or states could wage war on the United States. After 9/11 it became obvious that war could also be waged by terrorists operating anonymously and in the shadows. Are the laws of war—the Geneva Conventions, the International Convention on Torture—suited to this new reality of war? Whom may we detain? How may we interrogate those we detain? In the war on terror, do the laws of war permit us to be as tough as we need to be? Peter Robinson speaks with Peter Berkowitz and Jenny Martinez.