bah!
I have an implanted RFID chip already, I use it to open my door, via an RFID reader, but also I use it along with a RFID keyboard emulator dongle thingy as my password for my computer,
the range of mine is only a few cm off the skin, (they contain exactly the same tech that’s in work passes and door entry key fobs) but there are versions available that have a range of a few meters for instance the ones that are used to auto track stock as it enters and leaves warehouses (which I plan to get sometime this year in the nape of my neck)
you don't really need satellite tracking, just a bunch of long range readers around the prison, it allows you to track the inmate inside the prison, if there location is being tracked every second maybe that's how they hope to cut problems?
its going to be damn hard to get away with attacking another inmate if the guards can simply see who was around the person who was attacked at the time of the attack,
there is a 3rd type available too the has read and write capabilitys, not much good for tracking but still very very usefull
and just so you know the chips used to read write are whats stored in dogs, cats and cattle as it allows the owner of the animals to have there info stored direct to the chip, the read only versions such as mine and the long range one work by having a unique number that’s 16 digits long which it just repeats over and over as long as the reader is on it
its going to be damn hard to get away with attacking another inmate if the guards