If rogue states and terrorist groups outsmart intelligence assets, then they must deal with the Nuclear Emergency Search Team (NEST). Since its inception in 1974, NEST has fielded some eighty threats of nuclear terrorism. http://www.law.duke.edu/journals/djcil/articles/djcil8p79.htm#H2N17
2002 - LOOSE NUKES, BIOLOGICAL TERRORISM, AND CHEMICAL WARFARE: USING RUSSIAN DEBT TO ENHANCE SECURITY - HEARING BEFORE THE COMMITTEE ON INTERNATIONAL RELATIONS