No warrant is necessary to seize your papers at the border either, so why would anyone think that laptops would be different? And no, flash drives aren't legal

No warrant is necessary to seize your papers at the border either, so why would anyone think that laptops would be different? And no, flash drives aren't legally exempt either. They're just less likely to be noticed, at least for now. And encryption doesn't change things. One legal response to "I can't show you the content, hah hah" in your best Nelson voice is "that's okay, you can't take it into the US". Technology isn't the issue and it can't be the solution.