Pfc. Bradley Manning claims his nine months in pretrial confinement at the Marine Corps brig in Quantico, Va., amounted to illegal punishment. The hearing at Fort Meade, Md., resumed Wednesday after testimony last week.
Prosecutors are calling more than a dozen witnesses to counter defense claims that there was no justification for keeping Manning in his cell 23 hours a day, sometimes with no clothes.
The government claims the restrictions were to keep the 24-year-old intelligence analyst from hurting or killing himself.
Manning is accused of giving the online publication of hundreds of thousands of Iraq and Afghanistan war records and diplomatic cables.