'Dirty bomb' threat at hospitals remains

Nearly four out of five high-risk hospitals nationwide have failed to implement safeguards to secure radiological material that could be used in a "dirty bomb," according to a draft report by congressional investigators. Eleven years after the Sept. 11, 2001, attacks focused attention on the possibility that terrorists could use crude nuclear devices, the analysis by the Government Accountability Office described numerous instances of failure to secure highly radioactive material at hospitals.