Never. I would die with a hot gun in my hand before I let any government plant a tracking chip in my body.
It is too easy to loose the freedoms that it took millennia to earn. We must not forget that government is here to serve us not to control us. Fear is the tool of a wise dictator and they will quickly take our human rights for our own good.
We can never allow this to happen.
(I wrote this before I read the other resonses. I am happy to see we are all on the same page)