The Wizards Of Smell: How To Put A Police Dog On A Chip

Memo to man's best friend: In a few years, you may be relieved of your police drug-sniffing duties, thanks to a pair of Georgia Tech scientists. They have developed a handheld electronic nose that detects the presence of cocaine and other narcotics better than your cold, wet snout ever could.

The scientists--electrical-engineering professor William Hunt and chemistry doctoral candidate Desmond Stubbs--fused microelectronics and biotechnology to create a device that not only detects very small amounts of a substance but can also differentiate between one chemical and another. "I had seen some of the existing electronic noses and knew they weren't chemically...

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