Caitríona McLeish led a research trip to Washington D.C. during which she and James Revill spoke with key science, policy, and political actors on issues surrounding the process of science and technology review under the BWC. As a result of the time kindly provided by colleagues in the US, they were able to gather a valuable collection of material on how the process of S&T review is, and has been, conducted at the national and international level, as well as a range of views on options for the future of S&T reviews in the BWC. The team are grateful to those who took the time to share ideas and thoughts with us over the course of our busy trip.