Yes! Neutrino detectors can be used to detect nuclear weapons. (Ref: The above story is based on materials provided by Virginia Tech. )
Neutrinos are produced by the decay of radioactive elements, and nuclear reactors produce large amounts of neutrinos that cannot be shielded or disguised, which could help regulatory agencies monitor plutonium production.
Measuring neutrino emissions allows scientists to infer the plutonium content of a reactor from outside the building, according to a letter in Physical Review Letters written by Patrick Huber, an associate professor of physics and a member of the Center for Neutrino Physics at Virginia Tech, with Thomas Shea, a 20-year veteran of the International Atomic Energy Agency, and graduate students Eric Christensen of Westminster, Maryland, a doctoral student in physics, and Patrick Jaffke of Arlington, Virginia, a doctoral student in physics and a master’s student in nuclear engineering.