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Re:A US-born NASA scientist was detained at the border until... by jakewins on Sunday February 12, 2017 @04:53PM (#13631164)
Unless this wipes the device, it serves no use. They don't want your pin to browse through the phone - CBP policy is to take a full disk image, which would not work without the real pin as I understand it. This was the case in the OP article as well - CBP took a full copy of the phone.
Re:A US-born NASA scientist was detained at the border until... by mcv on Sunday February 12, 2017 @07:20PM (#13632087)
If they take the phone apart to get to the storage, they don't need your pin, unless the entire storage is encrypted, in which case an alternate pin should probably not decrypt the entire storage.

If they access it through the phone, they can only access what the OS allows.

I think an OS that would allow you to expose only a safe part of your phone, would be an excellent idea.