But the 100 mile rule? That covers damn near everybody in the US (>200 million, or 66%, give or take) subject to warrantless searches on the whim of whatever the police want?
It's more than that, it's being "close" to a border (you can argue if 100 miles is "close") and not on a whim but reason to believe you recently crossed it.
Yeah, where does this come from? Who keeps defending this, has it been challenged?
About 213 million people live in this zone, so 2/3 of people in the USA. So I guess the 4th amendment doesn't actually apply to most US citizens?
That's a separate issue I don't support outside of situations where they can reasonably prove/show you crossed without alrady going through the search. Luckily, at least so far afaik, it hasn't really been deployed in the maximalist way that turns the whole country into that zone. It's a lot easier to justify near physical land borders like Canada and Mexico than it is if it's being used within 100 miles of very controlled impermiable borders like international airports. Has it been used outside of the land borders?