It would probably be of no use OUTSIDE, but INSIDE one could be punished severely for “shielding” an RFID device.

By having an inmate’s RFID constantly “pinging”, one could keep track of wherever he is in the facility, weather the inmate is in a restricted facility, or if god forbid he’s “making a break for it”. It would not be inhumanly invasive, but by having an RFID continuously linked with and tracked by a central mainframe it does ease a prison staff’s burdon in tracking thousands of inmates. Think “deadlock” but without the lethality.

Fortunately for us normal humans, such a scheme could only work in a penal colony type environment where people are under legal penalties which rob them of what would be normal constitutional rights.

All the prison would have to do is ensure they’ve got transceivers in places where signal reception might be blocked by walls or whatever. As soon as someone goes outside their area the alarm sounds. If it’s setup properly you could probly have indidividual profiles, so certain ppl would be allowed in one area and not another, and vice versa for others.

But yeah, all it would take is for someone to wear 2 bracelets around and the system would just think the 2 ppl are together or near each other. They’ll still need to rely on all their existing methods, this will simply add another option.

Another case of the snake oil merchant.
There’s a sucker born every second.