GPS Technology for Felons

I think dangerous felons should have a GPS device on their body. That way if they escape prison the police will be able to track their movements. Also, any felon dangerous or not who escapes prison and is captured will have to wear one of these GPS devices because he has shown himself as being an escape risk.

The GPS unit could be put on a fire-proof water-proof saw-proof metal band either around the ankle, wrist or neck. The only way to take it off--if for instance the prisoner was found innocent later on and released--is by unlocking it by using two keys that the guards would have. I originally thought that if the band was tampered with for instance if the prisoner tried to saw it off that it would explode. But then that would end up possibly hurting innocent bystanders.