Rescueing hostages?

There is a chip made by a company called Applied Digital Solutions which is small as a grain of rice and can be injected under the skin or in the body. It has GPS locating capability, it monitors the vital signs of the individual and relays this info to a satelite. I wonder if this technology couldn't be used to find hostages in Iraq or any other country before they become victims of their captors. I've been toldthat this chip isn't capable of sending the signal if the host is inside a building, but it could send the signals, which can be tracked as the captors transport the hostage to and from their hiding places. Why hasn't the government or anyone else tried to utilize this technology? It could possibly save many lives if the millitary could at least know the position of the chip the last time it was outdoors. Of course those who had this device in their body would have to allow implantation prior to going,, and secrecy should be maintained about where the implant was in the body. What is your thoughts on this ?

Implanted tracking devices mean instant death to the user. Think about it.

There is problem for that kind of device...what kind of power source it would need ?
Because if it transmits signals, it needs energy for that.
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Originally posted by flycatch
Implanted tracking devices mean instant death to the user. Think about it.

Why ?...can u prove that ?

There is quite similar stuff which they put under the skin of domestical animals to have their personal data and of his owner...

Originally posted by flycatch
Implanted tracking devices mean instant death to the user. Think about it.

Please explain the instant death scenario. The frequencies would be covert, scrambled, secret, etc. And as far as powering them, they're already in use in animals. They'd be powered the same way as they are in them.

Also Flycatch, It would of course be kept secret about the use of these devices. And maybe your point was that the captors would kill them right away because of the implanted chips. Well, if they couldn't let them live long enough to ask for ransom or demands then there would be no point in taking them in the first place. It was just an idea i was musing on anyway.