Volume 109 of Terrorism: Commentary on Security Documents, "Terror-Based Interrogation", provides a documentary history of U.S. interrogation policy since 9/11. General Editor Douglas Lovelace presents in this volume the Bush Administration memos that asserted a legal basis for coercive interrogation, commonly known as the "torture memos", including those written by the controversial Department of Justice attorney John Yoo. Volume 109 guides researchers from those memos through Congressional efforts at banning torture to current Obama Administration steps to ensure compliance with international norms against coercive interrogation. Students and scholars alike will find in this volume an indispensible source for research on U.S. interrogation policies in the post-9/11 era.