Interesting, because it works the same way with DOD contractors. My brother, who worked for the same contractor as I did worked in testing and implementation has worked from his home for 15 years.
Me, they put on a flight to the first place God never meant anyone to live LOL.
Although In the defense and intelligence areas, I can see where picking apart a blown up hard drive is time sensitive.
They however have moved on to SSD drives (Far easier to extract info from platters) and new encryption levels, and the technology increases exponentially, it is hard to keep up with it.
If I were a betting man after another 1 or 2 years Edward Snowden won't be worth going after, because everything he knows will be out of date. This is purely speculation and not classified. (I hate having to qualify everything lol) But with what is going on in the business so to speak, better safe than sorry.