No need for a nano transmitter just a chemical or nuclear tag. That said there is no need for either of these as the vaccine itself is the tag and everyone gives their name when they get the vaccine. See the purpose is not tracking but infection and everyone injected is infected. Or does the government always tell the truth?as of now you couldn't secretly inject a tracking device that really track anything in a person. The big Hate Nazi routine was about a tracking chip for injections that does exist but it goes with the syringe and is not injected into the person, it tracks the injection numbers and were it was from by scanning a device over the top of all the empty syringes and you can get some small amount of information but absolutely nothing about the person who was injected. Thats the same dumb fuks that think the election was stolen.It is easy to make small tracking devices.
Putting them in to a vaccination shot would also be very easy.
The part that is hard and makes it silly is that it would not only be expensive, but you could at most track maybe a dozen people. Trying to track hundreds of people would cost billions for all the communications equipment and computers you would need.
And there is no point.
All you have to do in order to track people now is find out what they cellphone MAC address is.
With nano technology you can make transmitters really, really small.
The problems would be limited range and battery life.
If you had receivers all over the place, you can get past the range problem, but then can't track many people.
It is possible to use body heat as an energy source, so batteries may not be necessary.
But I doubt something like a thermocouple could be made small enough for injection and still work.