By some accounts, nearly half of America's incarcerated population is mentally ill — and journalist Alisa Roth argues that most aren't getting the treatment they need.

Roth has visited jails in New York, Chicago, Los Angeles and Atlanta and a rural women's prison in Oklahoma to assess the condition of mentally ill prisoners. She says correctional officers are on the "front lines" of mental health treatment — despite the fact that they lack clinical training.

"Most of [the correctional officers] will talk about how this is not what they signed up," Roth says. "Most of them have not had much training in dealing with mental illness — or they've had none at all."

On punishing mentally ill prisoners for self-harm, which is frequently a symptom of their illness.

One of the other things that we see often is that somebody will try to hurt themselves — either an actual suicide attempt or a cutting "self-harm incident" as they're called — and [that person] will be punished for trying to commit suicide or for trying to cut themselves.

To read more of Dave Davies article and on-air interview, please click here.