> While laws generally restrict U.S. spy agencies from surveilling citizens and other legal residents, they allow immigration authorities to conduct physical searches "within a reasonable distance from any external boundary of the United States." Regulations have defined this as 100 air miles from the border - an area including cities such as San Diego and El Paso.

Interesting...

That 100 mile zone is larger than you'd think, https://www.aclu.org/know-your-rights/border-zone