Since at least 2009, the DHS has asserted a legal right to copy/search the contents of anyone's electronic devices at the border. Its privacy assessment said no one has much privacy, at least not near US borders. Building on years of judicial national security deference, the DHS has recently expanded its searches of electronic devices, eliminating most of its adherence to the Fourth Amendment in the process. If your devices wander into the country's Constitution-free zones, you can expect to suffer diminished expectations of privacy.