The judge in the first American war crimes trial since World War II barred evidence July 21 that interrogators obtained from Osama bin Laden's driver, ruling he was subjected to "highly coercive" conditions in Afghanistan.

But Judge Keith Allred, a Navy captain, left the door open for the prosecution to use statements Salim Hamdan made at Guantanamo, despite defense claims that all of his statements were tainted by alleged abuse, including sleep deprivation and solitary confinement.

Hamdan, who was captured at a roadblock in Afghanistan in November 2001, pleaded not guilty at the start of a trial that will be closely watched as the first full test of the Pentagon's system for prosecuting alleged terrorists. He faces a maximum life sentence if convicted of conspiracy and aiding terrorism.