It sounds like this prevents books from being sent to prisoners no matter who the sender is. In California you are not allowed to mail books directly to prison

It sounds like this prevents books from being sent to prisoners no matter who the sender is. In California you are not allowed to mail books directly to prisoners, but you can order books from Amazon (or a few other large sellers) for shipment to the prisoner. They figure a shipment directly from those places should be contraband free. Hopefully they have some kind of anti-spoofing scheme. I think the CA policy is pretty common, so Arkansas must be going further.