http://www.theregister.co.uk/2004/04/16/bluetooth_tagging/

Above is an interesting evolvment. I also just saw an article about a new medical ring that people will wear that sends basic vital signs info back to the console. Combine that with expanded blue tooth technology from the above article and I think you have a great chance to create an excellent tracking device.

I saw this device being used that upon pressing of the button (looked like a watch) alarm company sends in EMS and FD and PD.

Matt