Just gonna repeat what I told @adetorrent
The chips here are the same as in your credit cards, so you can detect them within a very short range. You cannot track someone with these. Radio transponders that can detect shark and people (for example the people who aren't legally allowed to leave their house and have those leg strip things) from far distances are generally quite bulky.
RE: TALK-TALK: WHAT WOULD YOU TRADE YOUR FREEDOM FOR?