Explosive Trace Detection(ETD) Machines

These machines can) Machines detect minute traces (e.g., a millionth of a gram) of explosive residue picked up on a swab. The swab is inserted into the machine, which heats it and samples the vapors for specific chemicals. Trace detection can be used on a random basis, at passenger screening checkpoints, to check the outside of selected carry-on bags for explosive residues. Closed Bag trace detection can be used in combination with EDS machines
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 Major companies in this field

Morpho
smiths detection 
Thermo scientific