It painfully illustrates how long the process can take. The entire piece is very enlighting, pages 29-31 are more of what we know. Note the timelines for phasing MS in to layered tech, the article is almost ten years old .
"Recommendation 3: If TSA wishes to improve its trace detection capabilities, it should deploy MS-based detectors in a phased fashion, with successive generations of instruments addressing lower quantities of an expanded list of threat materials and more sophisticated security tasks. These tasks range from passenger screening at checkpoints to monitoring of the air handling system."
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