They can't. Doing it would get the Attorney disbarred and arrested. Plus any written documentation that he carries out and then hands off to a third party jeopardizes privelege and opens all of his written work product to examination.
Any letters between KC and the A's have to go through the prison screening system.
Exactly. Which is why I hope CA saved anything KC sent using JB as a go-between. Here, they actually stamp all mail, incoming and outgoing, as being viewed by correction officers.