Ignoring the 800-lb gorilla of privacy concerns, having a radio transmitter embedded in one's body that continuously transmits a unique signal raises interesting technical challenges.
How might it be constructed? Can it be directly powered by the body instead of having to rely on a battery?
One possible idea: a collection of magnets embedded throughout the body moves in a unique pattern because gait is unique. Then, somehow get moving magnets to induce emission of electromagnetic radiation.
Assuming powered by the body, the signal will likely be very weak. How can such a signal be received? How can it be triangulated to compute location? What if there are billions of people emitting such signals?
What useful information can be transmitted by the presumably weak low-bitrate signal? "I'm not dead yet."
Assuming a more conventional digital emitter, it might transmit only a few hundred bits per day, perhaps signed with a cryptographic signature.
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