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Pursuant to a legislative requirement, GAO provided information on the operational viability of pulsed fast neutron analysis technology (PFNA), which is designed to directly and automatically detect and measure the presence of specific materials by exposing their constituent chemical elements to short bursts of subatomic particles called neutrons, focusing on: (1) the status of plans for field testing a PFNA inspection system for counterterrorism and counterdrug purposes; and (2) federal agency and vendor views on the operational viability of such a system.

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