Drug sniffer

By Barry Fox Air travellers may soon be asked to walk through a drug and explosive-sniffing tunnel before boarding their plane. Ion Track Instruments of Massachusetts say they can pick up telltale signs of contraband just from air flowing over someone’s body (EP 992 782). The company takes Teflon-coated woven glass fibre and rubs it with an abrasive, which makes tiny cuts in the Teflon and breaks some of the fibres free. The glass fibre then acts as a filter at the end of a tunnel,
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