CIL Senior Research Fellow Mr Anthony Wetherall participated in the Legal Frameworks Workshop ‘Vigilant Marmot’ organised by the Global Initiative to Combat Nuclear Terrorism (GICNT) together with the governments of the USA, the Slovak Republic and Canada, and the United Nations Office on Drugs and Crime (UNODC). Held in Bratislava, Slovakia, from 24 to 26 January 2017, the event was attended by over 100 participants from GICNT partner nations and representatives of organisations, including the International Atomic Energy Agency (IAEA), UNODC, the International Criminal Police Organization (Interpol) and the United Nations Interregional Crime and Justice Research Institute (UNICRI). The workshop was organized into a series of seminars, panel discussions and scenario-based dialogues to address challenges in adopting or updating national legal frameworks for nuclear security, highlight obligations under international legal instruments against radiological-nuclear terrorism, and consider practical models for implementing these obligations. The event focused on the criminalisation penalties in the Convention on the Physical Protection of Nuclear Material (CPPNM), the 2005 Amendment thereto and the International Convention for the Suppression of Acts of Nuclear Terrorism (ICSANT). Mr Wetherall participated in the panel discussion on the definitions in the aforementioned instruments. He also served as a roaming expert for five workshop sessions.