If they had that level of security, there’s no way Hillary and her buddies could have done it.
It seems like the truth is that these classified systems were not as secure as advertised. They should have disabled USB, CD, and the local hard drive....and of course, you should have a network route to any non-secure servers.
You have to scan it to a thumbdrive or disc, then put that information onto a non-secure computer in order to email it. There is an ‘air gap’.