this post was submitted on 05 Dec 2023
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Didn't the soviet union have radio bugs that worked like that? No power of their own and hard to detect but if you blast them with RF they can use some of that energy to turn into small very weak signal transmitters. One of the culprits of 'Havana sickness' if I remember.
Found the sauce
https://en.m.wikipedia.org/wiki/The_Thing_(listening_device)