This, is what they refer to and all travelers can be random by exposed to this swab test routine from time to time. Really harmless really, fast and easy. The security officer typically swabs the little test clothing piece across your hands, in your bag, across your toiletry items if you carry on such and also your diabetic equipment, laptop and what other interesting pieces he might find in your carry on...
https://yourmileagemayvary.net/2018...d-getting-a-false-positive-on-tsa-swab-tests/
And then puts that swab clothing back into the analyzer machine, which only takes a few seconds to report back.
Btw a question to the pump users: Is it very troublesome to disconnect the pump to lay it loose on the separate luggage scanner belt, just for that 3-5 minute duration for you to pass through the body scan? (I stopped trying a pump like 12-15 years ago as back then it was messy with the feeder tubes, batteries, etc and I am travelling like 3-5 times a week with airplanes. But would have expected the technology to have developed to the better since then?)
I am myself working in the medical field where we employ permanent implanted devices to our patients for pacemaking/neurostimulation and they all carry with them a medical ID card identifying the device and their need. We do not get any stories from them this causing any trouble in the airports, so surprised why the moveable and external device as an insulin pump really is causing such problems. The airport staff worldwide is seeing it all, all the time and on a daily basis, so its not like an insulin pump is something new to them.