Criticism of NSA shouldn't overlook security gap that let Snowden near secrets
What's this about governments spying on their closest allies?
We called it "the bubble." It was a 12-by-15-foot acoustic conference room made of clear plastic and aluminum. There were at least five inches of space between the walls of the bubble and the walls of the room in which it was located. The bubble's plastic walls, ceiling and floor allowed visual inspection for electronic listening devices, or "bugs."