Lots of resources on the Internet to help you better understand explosives detection, for example:
www2.foi.se/rapp/foir2030.pdf
www.ncjrs.gov/pdffiles1/nij/grants/208861.pdf
But the explosive peroxide compounds triacetone triperoxide (TATP) and hexamethylenetriperoxide diamine (HMTD) are difficult to detect by conventional mass spectrometry methods.
Whatever equipment you select, do first produce a written performance specification that states that the equipment is to be capable of detecting all regular high explosives and also at least TATP. Some systems can’t identify this home-made high explosive, which is proving very popular with extremists.
Examples of good equipment that can identify TATP include the Scintrex EVD 3100 and 3500, but the EVD 3000, which is still widely sold, cannot detect TATP, and will leave you exposed if you are using it.
And don’t rule out extremist use of chlorate/sugar mix low explosives (usually beyond the detection capabilities of many equipments), which, as demonstrated by the IRA in Belfast in the 1970s, have the ability to demolish an entire building under certain conditions.
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