A military lawyer at Guantanamo Bay, Cuba, acknowledged Tuesday that microphones are hidden inside devices that look like smoke detectors in the rooms where defense lawyers meet detainees, but he said the government does not listen in on attorney-client communications. …

Defense lawyers in the case against Khalid Sheik Mohammed, the self-proclaimed mastermind of the Sept. 11, 2001, attacks, and four co-defendants have raised concerns that the government might be listening to privileged communications.

The issue arose when an unknown government entity, believed to be the CIA, turned off the audio feed from the courtroom where Mohammed is on trial to a public gallery. The existence of such a “kill switch,” as well as the immediate decision to turn off the audio, caught the military judge, Army Col. James Pohl, by surprise.