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Prison personnel are already prohibited from having two-way communication devices except their radios. The problem with jammers is the FCC. They are paranoid about allowing the operation of any devices intended to screw up communications, and rightfully so.

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It might be expensive, but you could make the entire prison a Faraday cage (although not sure how that would work if people are allowed to go outdoors).

Yeah, you could basically TEMPEST-harden the whole building. That would significantly increase the cost of building prisons, though.

Indeed. This doesn't leave an awful lot of room for profit. A prison is supposed to be a profitable business, what do people think this is? A service to society?

You reckon? It's basically surrounding the thing with chicken wire. How expensive could that possibly be?

Expense can't be the reason. Maybe the reason they don't do that is because the guards want their phones to work.

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