The National Academy of Sciences has issued a report concluding that the “main technical concerns raised about the Comprehensive Nuclear Test Ban Treaty (CTBT)… are all manageable.”Technical Issues Related to the Comprehensive Nuclear Test Ban Treatywas written over a two‐year period by 11 members of the NAS committee on international security and arms control. The panel of scientists, arms control experts, and former national laboratory and industry executives was chaired by John Holdren of Harvard University. The report concludes that “verification capabilities for the treaty are better than generally supposed, adversaries could not significantly advance their nuclear weapons capabilities through tests below the threshold of detection, and the United States has the technical capabilities to maintain confidence in the safety and reliability of its existing weapons stockpile without periodic tests.” The State Department is currently evaluating the report, which is available at http://www.nap.edu/html/ctbt.