Mr Barber said it was "right toprosecute organised crime" but that "too rigid a focus will send the signal that routine exploitation will be ignored by the authorities".
Sixteen lawsuits filed on behalf of about 200 prisoners were put on hold pending a ruling last year by a federal appeals court upholding the government's rightto detain and prosecute suspected terrorists and war criminals.
McCaskill, a member of the Senate's standing investigative subcommittee, said the Obama administration made the right decision by agreeing not toprosecute intelligence officers.