6 U.S.C. § 591g

The Office shall be responsible for coordinating with other Federal efforts and developing a strategy and policy for the Department to plan for, detect, and protect against the importation, possession, storage, transportation, development, or use of unauthorized chemical, biological, radiological, or nuclear materials, devices, or agents in the United States and to protect against an attack using such materials, devices, or agents against the people, territory, or interests of the United States.