I used to be a Technical Director at NETCOM and mobile devices such as media players, cell phones with cameras, etc. that could make a portable record were banned from being brought into the secure operations areas.
Over the years, I've seen lots of instances where people ignored the rules concerning security around computers and files just to see such incidents pop up over and over in the news.
The only real way to have a secure data network is if it never touches a publicly accessible routed network (ie the old hardward wired solution), files can't be downloaded, hard disks have to be taken out and locked up in a safe when they aren't in active use.
And frankly Social Security numbers are about as secure as your home address. Trying to keep those secure is an impossible mission since the barn burned down a long time ago, along with the rest of Chicago and the fires is at about St Louis now...