I'm fairly novice as to the current state of operations of our correctional system and what's happening on the ground, so my comments are really limited to my understanding of the research and literature.
Back to your question about ineffective and inhumane, it's obvious from the literature that not providing people with mental health and substance use services who need them is inconsistent with minimum standards that are endorsed by the World Health Organization, the United Nations, and many international and national correctional organizations. So I would refer you to those documents, but I can't say how they map against our current system.