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How ICE is watching you: A rundown of some of the tech the government is deploying to identify and spy on us
(minnesotareformer.com)
This is a most excellent place for technology news and articles.
Yeah, this isn't any kind of crazy technology there should be a way to do it with any device that has bluetooth and a processor.
All it does is listens for devices, almost like it would when you're trying to pair your earbuds. It just compares the detected MAC addresses vs a list and sends you a notification/alerts you if there is a match.
You can do the same with Wifi (the kids used to call it wardriving, back when modems were a thing and pringles cans had appreciable metal contents) but the people for whom that information is useful will know how to do it on their own.