"But so many people don't do it the right way. Sometimes people make me sick." With a sigh, she tries not to think back on all the examples of this she's seen in her years working at the prison.

"I guess alcohol is more popular because because can use it to completely check out of their lives for a while," she says, shaking her head. "It's sort of sad, really. I've known people who used it like that. Never pretty."

It's difficult not to remember that Murphy used to be one of them.