Allen examines the maritime counterproliferation activities of nations participating in the Proliferation Security Initiative, as set out in their Statement of Interdiction Principles. He explains the framework for conducting maritime interception activities, examines the importance of intelligence to PSI operations, and assesses the legal issues raised by those operations.

The threat of WMD use by terrorist groups and rogue regimes has added new urgency to global security discussions. Responses to the dangers posed by WMD include the nonproliferation regime, safeguards for WMD...