Gases/vapors/chemicals are often identified nowadays by mass spectrometers. The youtube details for this one says "a small portable ion trap mass spectrometer is demonstrated to analyze ink from paper. The mass spectrometer is taken for a walk. Outside chloroform is analyzed from a drain vent."
reference :
http://www.unsolvedmysteries.oregonstate.edu/GCMS_05.shtml
http://medgadget.com/archives/2006/03/mini_10_portabl_1.html
http://en.wikipedia.org/wiki/Mass_spectrometer
http://news.uns.purdue.edu/html4ever/2006/060316.Cooks.desi06.html
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