> So my guess is they applied little care to the oversight committee and handed them a sheet of what not to do, such as attempt to browse external web sites. The staffers did so anyway, and now are "penetrating" the firewall that didn't even exist except on paper. The agency now has a reason to restrain activities of oversight staffers that they didn't have before (for violating policy).

That sounds likely, but that also sounds like incompetence on the CIA's part. It also seems absurd for the CIA to decide what the CIA overseers can see.