On 24th September, the National Nuclear Security Administration reported that it has developed a way to identify suspicious shipments of “dual-use” goods. Dual-use goods are commodities that could be used for commercial purposes or to contribute to a foreign WMD programme and many of these commodities require an export licence. Each “fingerprint” is a profile used to identify a particular dual-use commodity using the fields of the shipping documents themselves. One example is a pressure transducer, which is a sensor used in uranium enrichment. It shares the same commodity code number as other pressure sensors, such as those used to check car tyres. But research revealed that transducers used in uranium enrichment typically cost more than $1,000, weigh a few pounds, and sell in quantities of a couple dozen at a time. This fingerprint distinguishes them from other pressure sensors that share the same code number, but are cheaper, lighter, and sold in larger quantities.