"Focusing on how the roles of the agency have changed, this book examines the roots of Homeland Security and its core missions. It examines the agency's focus and looks at what DHS should focus on in future. Diplomacy and international partnerships are addressed as they relate to resolving hot-button issues like narco-terrorism, intelligence sharing, terrorism funding, and immigration. This book is among the few on the subject to examine Homeland Security funding and perform a cost-benefit analysis to determine the best ways to fund homeland security functions"-- Provided by publisher.