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Re:Ex-Mozilla CTO: I was grilled for three hours at US airpo... by justboxing on Wednesday April 03, 2019 @01:38PM (#19565359)
> Customs can temporarily detain you, but they cannot refuse entry

Legal / Official Source please.

Re:Ex-Mozilla CTO: I was grilled for three hours at US airpo... by mikeash on Wednesday April 03, 2019 @01:54PM (#19565531)
Nguyen v. I.N.S. stated that citizens are entitled β€œto the absolute right to enter its borders....” Some more info and references to cases here: https://fas.org/sgp/crs/misc/home.pdf