Except that, in practice, that’s precisely what CBP interior checkpoints are. https://en.wikipedia.org/wiki/United_States_Border_Patrol_interior_checkpoints ht

Except that, in practice, that’s precisely what CBP interior checkpoints are. https://en.wikipedia.org/wiki/United_States_Border_Patrol_interior_checkpoints https://en.wikipedia.org/wiki/United_States_Border_Patrol_in... The DHS/CBP regulations claim 100 miles from a border and/or international airport, but the Supreme Court has (so far) held that warrantless searches in this case apply only at borders and their functional equivalents. (https://en.wikipedia.org/wiki/Border_search_exception https://en.wikipedia.org/wiki/Border_search_exception)