Can a high-tech sniffer help keep us safe?

Science stinks. So thought Megan Harries as she measured drops of putrescine and cadaverine -- the chemicals that give decomposing corpses their distinctive, terrible odor -- into glass vials. She then placed the vials on the floor, walked outside, and closed the door behind her. Harries was conducting the first field test of a high-tech sniffing device that might be used at ports of entry to quickly and safely screen shipping containers for dangerous or illegal cargo.

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