In this conversation, Matthew Stibbe interviews Henrietta Wilson, a PhD candidate at King's College London, about her work in open source investigations, particularly in the context of the Biological Weapons Convention. They discuss the importance of high-quality information in policy making, the role of AI in arms control, and the challenges faced in distinguishing between legitimate and harmful uses of technology. Henrietta emphasises the need for public literacy in research and the value of diverse expertise in open source investigations.