So you just exposed yourself as ignorant to this? I love it when you do that.
Generally speaking, searches within 100 miles of the border are more permissible without a warrant than those conducted elsewhere in the U.S. The doctrine also allows federal agents to search people at border crossings without a warrant or probable cause.
The federal government defines a “reasonable distance” as 100 air miles from any external boundary of the U.S. So, combining this federal regulation and the federal law regarding warrantless vehicle searches, CBP claims authority to board a bus or train without a warrant anywhere within this 100-mile zone.
The Fourth Amendment of the U.S. Constitution protects people from random and arbitrary stops and searches. Although the federal government claims the power to conduct certain kinds of warrantless stops within 100 miles of the U.S. border, important Fourth Amendment protections still apply. This...
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