Homeland security has occupied the news since 9/11. Still, much of the research about security risks, types of threats, and other vital data remains unsubstantiated. Using the tools that verify scientific finding, the editors have moved the issues of homeland security to a level above rhetoric and hearsay. Authors, in this volume, review the current literature, critique current information, and provide suggestions for future research in several areas. Topics in this volume include: Risk and Crisis Communication Strategies in Response to Bioterrorism; Security Issues in Water Infrastructure; Fundamental Causes of International Terrorism; Understanding, Measuring, Modeling, and Management of Risks to Homeland Security; Biosensors for Detection of Nerve Agents and Agricultural Pesticides; Detection of Bacterial Pathogens and Toxins; Anti-crop bioterrorism; and Medical Biosurveillance. This volume is a must for all who are involved with issues of homeland security from planners to administrators to researchers. The editors of this volume are members of the Purdue Homeland Security Institute, Purdue University, West Lafayette, Indiana except Daniel R. Dolk who is at the Naval Postgraduate School, Monterey, California.