Did a search and found the thread, which I had missed earlier:
http://forums.civfanatics.com/showthread.php?t=257932. That's a new level from what already was pretty bad. However, I don't consider it to be a danger. It's entirely impractical. Admittedly, quite a few of the current security measures are, but this goes far beyond any of them in the impracticality. I really don't see this as too much of a concern - though that doesn't make it any better.
I still maintain that by the Fourth Amendment such searches would be illegal. I can see exceptions for when something poses a potential imminent danger - hence why I consented to a luggage search when my board game timer inconveniently started ticking at the security checkpoint last time I flew

- but there's nothing about a hard drive that should warrant a search, unless it's been physically tampered with, at which point examining the files on it likely isn't what the police officers should really be doing.