Global concerns over illicit trafficking in nuclear materials intensified in the 1990s. Some
countermeasures were taken, including steps involving the IAEA. But greater international cooperation, and higher standards of physical protection, may be needed to guard against the chance that weapons-grade material might fall into the wrong hands. This viewpoint article — based on a presentation to the IAEA’s International Conference on Physical
Protection in November 1997 — advocates steps to raise global standards, and to have them monitored internationally.