The jury has now retired to consider a charge of attempted murder against 37-year-old neuroscientist Aafia Siddiqui.
She is alleged to have used a rifle to shoot at US agents while waiting to be questioned in Afghanistan.
Her defence team claims that there is no forensic evidence the rifle alleged to have been used was ever fired.
None of the US soldiers or agents in the room was injured in the incident, but Ms Siddiqui herself was shot.
She maintains she is innocent.