In presenting this database and portal, the University of Maryland says that the prospect of chemical, biological, radiological, and nuclear (CBRN) terrorism has been a source of policy, strategic, and policy concern since the mid-1990s. However, most discussion of CBRN terrorism phenomenon was theorising based on a limited number of high-profile events or speculation based on non-CBRN analyses. The Unconventional Weapons & Technology (UWT) Division of the National Consortium for the Study of Terrorism& Responses to Terrorism (START) developed 3 databases: Profiles Of Incidents involving CBRN and Non-state actors (POICN); Chemical And Biological Non-State Adversaries Database (CABNSAD); and Radiological And Nuclear Non-State Actor Database (RANNSAD). These databases represent the largest open source publicly available databases on ideologically motivated CBRN events and individuals who pursue and/or use CBRN weapons.