The defendant's attorney 'cross-examined' the witness and tried to show that his earlier testimony was false.
the 'examining room' [=a room in a doctor's office where the doctor examines patients]
He was 'examined' by several doctors, who found nothing wrong with him.
(..) - Mm-hmm. Who are you? I'm Dr. Barnwell, one of the new attending physicians. We haven't met, so I thought I'd examine you myself. Okay, so I see here that you've had two heart attacks over the last months. Yeah, minor ones, I think one was angina. (..)2004 The Notebook