The most fucked part about this is that these chucklefucks don't seem to understand even basic concepts such as conservation of energy.
To track a person's position with a piece of hardware, such as a chip, that chip needs to be sending out information.
Sending out informing requires making an organized wave travel through space.
Making an electromagnetic wave travel through space requires modulating an electromagnetic field.
Modulating an electromagnetic field requires energy.
Where, exactly, do these people think that much energy is going to be coming from? The chip? The chip that is not big enough to hold a battery or even a significant capacitance field?
I mean, I suppose they could use near field induction systems to communicate voltage, but that's not exactly subtle technology, and would be easy to block, or to use to locate and remove any implanted hardware.
And that's another thing... Like, if you have a transmissive chip in you, you just need to get an EM detector and dig it out.
As to kill switches, this is totally a thing that would be possible.. if you were willing to increase the size of the chip by an order of magnitude and increase the power requirements even more, and add an additional radio, thus making it even easier to remove or spot going in. There are also only a few poisons that are reliably deadly in that small of doses, and none of them act instantly. You would be creating 500 people with nothing to lose, a day or two to live before effects became apparent, and a vendetta against the people who killed them.
These people are living in a fantasy world of science fiction.