This powerful statement from the most recent Commission on the Prevention of Weapons of Mass Destruction (WMD) Proliferation and Terrorism serves as ample warning of the dire threats faced by the United States and indeed the world from a bioweapon successfully deployed by a determined and knowledgeable terrorist. In thinking about the potential for such a bioterror attack, several important questions serve to frame the discussion. Do terrorists have the desire to employ WMD, and in particular biological weapons?