ABSTRACT
Change is the only constant in addressing terrorism. With that in mind, the articles in this issue of the FBI Law Enforcement Bulletin look at the varied forms of terrorism and America's responses. While the threats are diverse, each with its own challenges, common threads link them, and they should be treated not simply as a case or group but as part of a larger threat picture. “The Evolution of Terrorism Since 9/11” looks at the overarching threat, how it has changed, and how Americans must adapt to the changes, from the threats of al-Qaeda to homegrown violent extremists.
