Frontmatter -- Letter Report -- References -- Attachment 1 The Joint Explanatory Statement and the Statement of Task -- Attachment 2 Evaluating Testing, Costs, and Benefits of Advanced Spectroscopic Portals for Screening Cargo at Ports of Entry INTERIM REPORT -- Attachment 3 Committee on Advanced Spectroscopic Portals Roster and Brief Biographies -- Attachment 4 Nuclear and Radiation Studies Board -- Attachment 5 Reviewers.