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Re:Border Search of Electronic Devices – CBP Directive [pdf] by foobarbazetc on Saturday January 06, 2018 @03:21PM (#16087232)
Can LPR’s be denied entrance for refusing to unlock?
Re:Border Search of Electronic Devices – CBP Directive [pdf] by DrJokepu on Saturday January 06, 2018 @09:14PM (#16088688)
No, an LPR can only be denied entrance if:

(a) They are regarded as seeking admission and they are found inadmissible. Refusing to unlock their device will not make an LPR regarded as seeking admission as it’s not a reason listed in INA 101 (a)(13)(C): https://www.uscis.gov/ilink/docView/SLB/HTML/SLB/0-0-0-1/0-0...

(b) They are deportable. Simply refusing to unlock a device in itself will not make someone deportable as it’s not listed in INA 237 “General Classes of Deportable Aliens”: https://www.uscis.gov/ilink/docView/SLB/HTML/SLB/0-0-0-1/0-0...

Re:Border Search of Electronic Devices – CBP Directive [pdf] by tptacek on Saturday January 06, 2018 @03:31PM (#16087285)
Probably not, since they also can't be denied entrance by executive order. But I'm not a lawyer!
Re:Border Search of Electronic Devices – CBP Directive [pdf] by tom169 on Saturday January 06, 2018 @08:07PM (#16088458)
I believe an LPR could be paroled, pending a hearing with an immigration judge.

Saying that, the only people who cannot be denied entry to the US are indeed USC.