The Bulk Currency Detection System (BCDS) is a device that can smell money by taking a gas sample from wherever officers think the money might be hidden, be on it travelers, in their luggage or stored somewhere in vehicles or shipping containers. Using sensors, the device can analyze samples in less than a minute, researchers say.
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Source:
http://www.newsweek.com/sniffing-out-smuggled-money-about-get-easier-new-device-264299