That's what the ACLU says the Border Patrol's interpretation is. When I actually read the regulations and the statutes themselves, as far as I could infer, the external boundary was meant to refer to the international water boundary.
I'm afraid I don't recall the exact citation off the top of my head, but I'd like to see more evidence for the ACLU's claims than, well, just the ACLU saying so. Especially when the ACLU itself points out that the law and regulations doesn't actually give the Border Patrol some of the powers it has.
(I should note there's a distinction between the actual legal authority and the actual policies applied in practice--I'm arguing that the legal authority is 100 miles from the international waters boundary; that the Border Patrol is exceeding that is probable, but the ACLU is, IMO, conflating the legal and actual effects to lobby specifically against the law rather than lobbying against the Border Patrol acting illegally).
I'm afraid I don't recall the exact citation off the top of my head, but I'd like to see more evidence for the ACLU's claims than, well, just the ACLU saying so. Especially when the ACLU itself points out that the law and regulations doesn't actually give the Border Patrol some of the powers it has.
(I should note there's a distinction between the actual legal authority and the actual policies applied in practice--I'm arguing that the legal authority is 100 miles from the international waters boundary; that the Border Patrol is exceeding that is probable, but the ACLU is, IMO, conflating the legal and actual effects to lobby specifically against the law rather than lobbying against the Border Patrol acting illegally).