By JOSHUA BENDER
Capital News Service
LANSING — Many Michigan prisoners suffering from serious mental illnesses or developmental disabilities spend their days in isolated 23-hour lockdown. That might be harmful to their mental health, according to a recent national study published in the American Journal of Public Health. It found that prisoners spending time in what is also called segregated housing are nearly seven times more likely to harm themselves. Some Department of Corrections officials say they don’t believe that’s the case inside Michigan’s prisons. A daily average of 35 seriously mentally ill or developmentally disabled inmates spent time in solitary confinement for 2013-14, Michigan prison officials said.