Mark Nestmann gives a word of warning about the confidentiality and security of your personal or professional data if you cross a US border:
For instance, if you’re an attorney, your laptop may contain information subject to attorney-client privilege. If it does…well, too bad. According to published CBP guidance, “a claim of privilege …does not prevent the search of a traveler’s information at the border.” Or perhaps your smartphone contains trade secrets or other data you’d rather not share with the U.S. government. But when you carry it across a U.S. border, you’ve given the government permission to review that data and retain it indefinitely.
Take time in advance to either minimize the quantity or confidentiality of data transported, or encrypt it really well.