where do one gets such a machine and how one comes with the idea of getting it in the first place. As an employee of a BigCo. such idea has never crossed my mind (and we do have our share of angry/frustrated/on-the-verge-of-nervous-breakdown customers - i mean it is real enterprise software we're dealing in after all :)
Corporate security, insurance carriers (risk management on sterroids), investors or lenders (also fundamentally risk-oriented), might suggest or require mitigations.
Devices are sold through the usual channels:
https://duckduckgo.com/?q=mail+screening+chemical+detection&...
Once you're known enough, you will draw the ire of some unstable person wanting to do bad things to you, no matter what you do.
Is this what the TSA uses when they swab my dog/my hands? I always assumed it was to look for a bomb but I’ve never asked because I figured using the “b” word at the airport would only bring more trouble.
I've had multiple friends confirm a negative test for GSR when they'd just been at the shooting range in the same jacket/etc.
We still have people accidentally bring guns/knives on planes...
They often contain glicerine, which can be a compund in explosives.