FrontMatter -- Acknowledgment of Reviewers -- Contents -- Executive Summary -- 1 Introduction -- 2 Elements of Detection: Concepts, Threats, and Devices -- 3 Systems of Detection -- 4 Chemical Characteristics of Bombs -- 5 Existing Detection Techniques and Potential Applications to Standoff Detection -- 6 Biological Markers -- 7 Unexploited Potential Bases of Detection -- 8 Summary of Committee Recommendations -- Appendixes -- Appendix A Statement of Task Review of Existing and Potential Standoff Explosives Detection Techniques -- Appendix B Glossary -- Appendix C Presentations to the Committee.