Come now! As a former-Marine you must surely know that the government is the last to implement any new technology. Seriously, cameras in a secure-reading room might be used to resolve what is actually on the page being read. Bad idea. Gotta have that compartmentalized security, ya know.
What I'd like to know is why Sandy Berger was permitted to take a briefcase into the Reading Room. I've done contracting work at the US Mint and I can tell you THAT is absolutely not allowed (plus you get a 'wand-job' on the way out).