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One technique compares reflected [[ultraviolet]], [[infrared]] and [[visible light]] measurements on multiple areas of the suspect material. This has an advantage over olfactory methods in that a sample does not need to be prepared. A patent exists for a portable explosive detector using this method.<ref>{{Cite web |last=Mullins |first=Justin |date=2008-05-28 |title=Portable explosives detector |url=https://www.newscientist.com/blog/invention/2008/05/portable-explosives-detector.html |archive-url=https://web.archive.org/web/20080911045557/https://www.newscientist.com/blog/invention/2008/05/portable-explosives-detector.html |archive-date=11 September 2008 |website=[[New Scientist]] Blogs}}</ref>
Mass spectrometry is seen as the most relevant new spectrometry technique.<ref>{{Citation | url = http://www.nap.edu/catalog/10996.html | title = Opportunities to Improve Airport Passenger Screening with Mass Spectrometry | publisher = [[National Academies Press]] | doi = 10.17226/10996 | isbn = 978-0-309-09240-1 | year = 2004 }}.</ref> Several manufacturers have products that are under development, both in the US, Europe and Israel,<ref>{{cite web | publisher = Laser detect |url= http://www.laser-detect.com/brochures/LUMIN9689_narrowgate.pdf |title= Lumin 9689 Narrow gate |access-date=2012-04-11 |url-status= dead | type = brochure | format = [[Portable document format|PDF]] |archive-url= https://web.archive.org/web/20120823083344/http://www.laser-detect.com/brochures/LUMIN9689_narrowgate.pdf |archive-date= 2012-08-23}}</ref> including Laser-Detect in Israel, [[Teledyne FLIR|FLIR Systems]] and Syagen in the US, and
===X-ray machines===
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