Border Patrol Agent Forwarded All Emails To Someone Else's Gmail
Found on Techdirt on Friday, 28 August 2015

The very first one involves the CBP agent forwarding all of his email to a personal account, but messing up the configuration, so that it actually forwarded to someone else's Gmail account (someone with a similar name) -- and this mistake was only noticed when this "civilian" responded to an email he had received via this forwarding, and the response was sent to a wider mailing list of Homeland Security employees.
Not sure about to you, but this doesn't make me feel much safer about DHS at all. And, remember, DHS is one of the government bodies currently looking to manage the government's cybersecurity efforts -- and they're considered the better option given just how little people trust the NSA or the FBI (the two other main contenders).
It could be so simple: when hiring new agent, tell them that will be fired instantly if they use unapproved services for communication. Not that common sense should have told you that already.