I'm more of the opinion that cameras SHOULD be allowed in. If it's just regular information being discussed then why the need for secrecy?
Unless trade secrets that would ruin a company or real national security topics (none of the oh my god terrorism bullshit either) are under investigation... what has the government or corporation got to hide?
Freedom of information people, it is your right.
If it happens once, it's a bug. If it happens twice, it's a feature. If it happens more than twice, it's a design philosophy.