Cargo containers are an easy target for terrorists to deliver a potential nuclear disaster. Following the terrorist attacks on September 11th, Los Alamos scientists began using muon scattering tomography to detect and identify concealed nuclear threats. Through a collaborative partnership, Decision Sciences International Corporation (DSIC) signed an exclusive license with Los Alamos National Laboratory and, based on the muon scattering technology, developed the Multi-Mode Passive Detection System (MMPDS). This advanced scanning device locates heavily shielded nuclear and radiological threats inside cargo containers as well as vehicles and rail cars. It can also be used for explosive and contraband detection. Currently, Los Alamos is finalizing a Work-for-Others Agreement with Fukushima site in Japan to assess and aid clean up.