They are indiscriminate. They block ALL signals, including the ones public safety might just wanna use. Perhaps some sort of localized tower combined with an encryption scheme utilizing gps?
CC
Bingo!
Read my FRmail....but I think you already did.
and what did CO's use for communication before cell phones?
you can jam a cell without jamming a radio. 2 completely different signals.
Way not comeply Ban cell phones in prison. CO's included.