Other union investigators suggested a plastic cap for CAM (easily purchased at any hardware store).
Actually it was the little rubber doo-hickey that goes on the end of a crutch.
(break break)
Think of the logistics for a second - I'd imagine that for every two-man cockpit, you'd need at least two people whose full-time job would be to listen to CVR data. That'd be over 600 people at my company alone.....