...except at border crossings (which may be at a US border crossing or at an international port of entry like an airport gate where US customs has a checkpoint)

...except at border crossings (which may be at a US border crossing or at an international port of entry like an airport gate where US customs has a checkpoint). U.S. Customs and Border Protection (CBP) may search any electronic devices without probable cause at these points. see https://informationsecurity.princeton.edu/sites/g/files/toruqf1121/files/searches_of_electronic_devices_at_the_border_-_faqs_-_march_2017_0.pdf https://informationsecurity.princeton.edu/sites/g/files/toru... and https://www.cbc.ca/news/science/usa-border-phones-search-1.4494371 https://www.cbc.ca/news/science/usa-border-phones-search-1.4... Canada doesn't behave this way - https://www.harrisonpensa.com/new-limits-imposed-on-border-search-of-phones/ https://www.harrisonpensa.com/new-limits-imposed-on-border-s...