"We are not now developing, nor do we have any plans to develop, anything other than an external, wearable device." Statement last winter by the company that just received FDA approval to begin implanting tracking chips in people. This whole thing will sound like the worst sort of conspiracy theory, but just THINK about these things. They are real. They are here. Anything that can be implanted can be carried without bother. What is the advantage of implanting? What are the applications where this is required functionality? politechbot.com: More on FDA permitting use of implantable ID chips in humans | 
