Here's an excerpt from Schneier's blog:
My guess is that if Kip Hawley [Administrator & Assistant Secretary of Homeland Security -- can simply copy your entire hard drive or even take your device and hang on to it indefinitely.The Manhattan Project Poll on the Use of Atomic Weapons, July 1945Unfortunately, seizing laptops and cameras at the border isn’t the only travel security measure that infringes on our civil liberties.
Just last month, the U.S. government's "terrorist watch list" surpassed one million names and is growing by over twenty-thousand names per month. The watch list includes the names of prominent people, like Senator Ted Kennedy (D-MA), plus hundreds of thousands of Americans, far more so Japanese), and so on.