It's not a tracking chip. It's just a chip that has your blood type, and things like that on it, it doesn't track you. Its so Medical personnel can run a scanner over it and see your medical records. lLke if you're in an accident and need blood, they can scan the chip and give you a drip alot quicker than searching you for ID, finding ID (sometimes they don't), doing a background check, and then getting you what you need (and there can be mix-ups along the way
). Hell, I'd get one
if it didnt have to be injected (I'm scared of needles).
Like they said, it's the same technology that cats and dogs use. What cats and dogs have are basically implantable pet tags that have the pet's information on them.
And there's no way they can fit a tracking device into something that small. The smallest GPS transceiver is about the size of 4 stacked US quarters. And if they did, I doubt that dude in the picture (he looks like a working or middle-class person--muscular, fit, and a white t-shirt) could afford it
Only way they could track you with the chip is if you had some guy following you around 24/7/365 with his little scanner pointed at it. And in that situation it'd be more efficient to just follow you, sans scanner.
You need to worry as much about being tracked by this as soldiers do about being tracked by their dog tags.