“It’s common” that people end up using unclassified systems to transmit classified information, said Jeffrey Smith, a former CIA general counsel who’s now a partner at Arnold & Porter, where he often represents defendants suspected of misusing classified information. “There are always these back channels,” Smith explained. “It’s inevitable, because the classified systems are often cumbersome and lots of people have access to the classified e-mails or cables." ...It's true that the law isn't always enforced. General James Cartwright -- who, by the way, headed the list of signatories on that letter from 36 general officers supporting the Iran nuclear deal -- was being investigated for leaking top secret information to the press about a US-Israeli effort against the Iranian nuclear program. The investigation died, officially because it 'might confirm the existence of such a program.' It died just before the Iran deal was announced... but I'm sure it's merely a coincidence that he's now vocally leading the pack in favor of that deal.
"It’s common knowledge that the classified communications system is impossible and isn’t used,” said one former high-level Justice Department official. Several former prosecutors said flatly that such sloppy, unauthorized practices, although technically violations of law, wouldn’t normally lead to criminal cases.
So yes, there's incredible corruption. Hillary may yet go down, though: not because of the law, which is enforced only as a tool of the powerful, but because she's become a liability. If Biden gets in the race, look for her to be prosecuted as a way of clearing the field for him. For political reasons, that is, not legal ones.