A false positive?

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As I mentioned previously, when you go through one of the GE Entryscan explosive scanners, the pause between the start of the scan and the "green light" indicating you're OK is unnervingly long. Even more so since I saw someone--a pretty well-dressed businessman--actually trigger the detector the other day when I was going through SFO. I guess this must happen fairly frequently, since I was kind of expecting him to be hauled away and never seen again, but it looked like they just ran him through the old-stye person digging through your luggage check.

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It is pretty common, plenty of chemists make regular use of the compounds that the detectors see. Farmers use nitrates for fertilizer.

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