Interesting. I'm very much against the use of jamming and tend to agree with the CTIA stance on the matter. There are benefits to allowing the staff of prison

Interesting. I'm very much against the use of jamming and tend to agree with the CTIA stance on the matter. There are benefits to allowing the staff of prisons to carry cell phones and those benefits would be gone. In addition, there's always the possibility that the deployment of jamming equipment results in nearby areas suffering degraded signals. It's not like putting up a concrete wall. Detection alone wouldn't be sufficient, and an authenticated system seems like it would be very tricky to sort out since the prison is going to be sharing cell towers with non-prison areas. In all three cases, I don't think it will eliminate the problem, but like most security issues, it's best to throw everything you can at it so if one component fails there's three backing you up.