This seminar will address the law governing national security investigations and related litigation. Topics will include electronic surveillance conducted pursuant to the Foreign Intelligence Surveillance Act (FISA), detention and interrogation of suspects, National Security Letters and other investigative tools, and related topics. National security law is often inaccessible, and can be particularly hard to follow when divorced from the context of historical tradition, governmental structures, and the operational reality in which it functions. The seminar will aim to present national security law in context, exposing students as much as possible to the real-world effects of applicable legal standards and rules. Participation in a half-day investigative exercise and several short papers are required. The class is not open to 1Ls.