In Seeking To Evaluate The Efficacy Of Post-9/11 Homeland Security Expenses - Which Have Risen By More Than A Trillion Dollars, Not Including War Costs - The Common Query Has Been, 'are We Safer?' This, However, Is The Wrong Question. Of Course We Are 'safer' - The Posting Of A Single Security Guard At One Building's Entrance Enhances Safety. The Correct Question Is, 'are Any Gains In Security Worth The Funds Expended?' This Book Applies Risk And Cost-benefit Evaluation Techniques To Answer This Very Question.