"What you can find in the trash is simply amazing," said Mitnick, holding up a "souvenir" from his earlier days: a printed directory listing the name, phone number, email address, direct reports and other information about every employee in the company."
Which is why any company that cares about safeguarding it's secrets shreds their data. I worked in a Message Center at an AF base for 4+ years handling classified information.
ALL paper material had to be shredded with a shredder approved for destruction of classified material. Once it was shredded it was then put in a bin to be recycled or just thrown in the trash, once shredded it was safe. (No, not even the Penguin (AKA Danny Devito) would have been able to piece that stuff back together.

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Of course all it takes is one person taking a piece of paper home with certain information......This is why you constantly remind your users, have security clearances, and punish those people who do break the rules.
Modern technology is an enabler for such attacks: if a hacker can worm his way into a conference room for just a few minutes, for example, an wireless access point can be plugged into an out-of-the way network access point, providing an open back door into the network even when the hacker is parked outside the building
LOL. Only if the wireless network was wide-open. If so then it deserved to be "hacked".
"We can't expect our employees to be human lie detectors,
Errr...why not? Not only for IT but for any work environment. If someone you don't know questions you or ask you something that they don't need to know for some unknown reason, it's pretty obvious THAT THEY DON'T NEED TO KNOW. It's not necessary to worry if someone is lying to you or not, it's all about NEED TO KNOW. This is #1 on security clearance, doesn't matter if you have an TS/SCI, if you don't work there or don't have any relation to the work then you don't need to know.
Gee, I wish I could go around to conferences spouting common sense information. Yes, this is common sense people. You don't go around to every hobo on the street giving them your PIN number do ya?