If you don't tell me where you are, I'll know anyway. The next time you go to the doctor for routine surgery, you'd better hope your spouse hasn't paid off the good doctor to insert on of these!
Apple Co-Founder Creates Electronic ID Tags
Apaprently you can track just about anything with these new devices. I'm not so sure I like having chips to locate someone. All though I can see the merit of putting these types of devices on a child or pet.