Look up offset in the dictionary. It doesn’t mean all. Part of the money is used to pay part of the added costs of the phone calls. Part of the money pays part of other prison related costs. In other words, the monies are mingled.
The article doesn’t state whether the money charged for phone calls is greater than, equal to, or less than the costs. In all likelihood, it’s about equal.
All of the money goes toward running the prison, which just happens to house the prisoners. So I’m still not feeling any pity for the criminals, and I still don’t think the taxpayers and/or paying telephone customers should have to subsidize phone calls and/or other luxuries for criminals.
Hey, maybe we can start charging families for the food their loved ones get in prison!