Honestly, is this really that big of a concern? This sounds like something that may be necessary for the OBLs or <murderous drug lord>s of the world. But in general, this level of paranoia about being able to communicate with the outside world is just insane. It only serves as an easy excuse to exert an obscene level of control over these people's lives.
From what I've seen (in documentaries and the show lockup raw) violent offenders will try to harm the families of prison personnel and others by sending and receiving orders. It's a real problem. It's not as easy as restricting access from just these people because they can force other inmates with Internet access to do their bidding.
Its possible that lower security prisoners can be treated differently.
