After the 9-11 attacks it was clear that we need something to detect bombs or drugs hidden, no matter where, without exploring and opening every single piece of luggage. That's why scientists at Osaka University in Japan have been working on it to get this new microchip, which can detect any "white dust" from drugs to explosives just with radio frequence.
It works at an unbeliavable temperature of -196ºc , and it's much more sensitive than x-rays for example. The mecanism is explained on the link below, and for now it seems the perfect solution for airports and places where scans are mandatory but crowds make them difficult and long to be made.
New Microchip Detects Drugs and Explosives
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