- 54 percent of local jail inmates had symptoms of mania, 30 percent major depression and 24 percent psychotic disorder, such as delusions or hallucinations.
- 43 percent of state prisoners had symptoms of mania, 23 percent major depression and 15 percent psychotic disorder.
- 35 percent of federal prisoners had symptoms of mania, 16 percent major depression and 10 percent psychotic disorder.
UPDATE: A commenter from Sentencing Law and Policy blog rightly points out: "Look closley at the methodology of this study -- it's poor. This is similiar to other studies by DOJ on this topic. For instance, there is no diagnosis in the DSM for "mania" -- mania is a symptom of bi-polar disorder, but not a diagnosis itself. Plus, any DSM diagnosis was allowed (but not via a SCID interview, but through self-report). I could go on and on..."
He's right, IMO. That number sounded high when I reported it. In Texas, to my knowledge, we don't have great statistics on this subject, but estimates I've heard range from 16-22% of inmates having "serious mental illness" of the type that can be diagnosed by a mental health professional - self-reported symptoms of "mania," as in the DoJ study, capture a much broader but less well defined pool of folks.
RELATED: For a grim read, see this report from 2002 (pdf) on how Texas uses administrative segregation - i.e., ad-seg, or 23-hour per day solitary confinement - for some mentally ill inmates literally for years. It was compiled by an expert hired as part of the denouement of the Ruiz litigation.