Well as Skye just explained, it under very special/limited circumstances and normally family which would not include pen pals. I can clearly see the reason for the regulation being enforced. You could be cross posting something that seems perfectly harmless, next thing you know, another inmate is knifed on a yard that you knew nothing about. I could see if you had been writing the inmate for a very long time and the situations were different, but not solely based on what has been described here.

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"Thats it then, they will go on double, secret, probation..."