I used to work at a "secure" site for a large pharmecutical company, working with financial data on what they paid contractors. The blinds were drawn and could not be opened. Cameras were banned. Yet the guards had no problem with me waltzing past carrying a laptop which had records of every payment made to outside parties in North America in the previous three years. (I was working on a query tool, and wanted to keep on working on the train.)

I don't mean that they had no problem with me walking past with a laptop that happened to have that. I mean that I specifically pointed out to them that that is what I had (in disbelief over being unable to open the blinds) and they simply did not care because it wasn't addressed in their regulations!