I agree that forcing people to read their mail on only certain devices at certain times under supervision is not a human-being-respectful rule. But there is also the consideration that probably it's there for the reason of preventing drugs from being laced into the mail, even into the very paper.

How about they do the simple step of scanning the mail, and reprinting it for the inmates to receive a physical copy? Of course, then you get into the problem of how much a markup is the shitty jail company going to apply to that.