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Rh 193 (CA10 1964) (finding §2255 inadequate or ineffective after Alaska territorial court was dissolved and federal and state successor courts declined §2255 and state-habeas jurisdiction, respectively). The saving clause might also apply when “it is not practicable for the prisoner to have his motion determined in the trial court because of his inability to be present at the hearing, or for other reasons.” Hayman, 342 U. S., at 215, n. 23 (internal quotation marks omitted).

In addition, the saving clause ensures that §2255(e) does not displace §2241 when a prisoner challenges “the legality of his detention” without attacking the validity of his sentence. To give a few examples, a prisoner might wish to argue that he is being detained in a place or manner not authorized by the sentence, that he has unlawfully been denied parole or good-time credits, or that an administrative sanction affecting the conditions of his detention is illegal. See generally Samak v. Warden, FCC Coleman–Medium, 766 F. 3d 1271, 1280 (CA11 2014) (Pryor, J., concurring) (explaining that “[t]he ‘detention’ of a prisoner encompasses much more than a criminal ‘sentence’ ”). The briefs before us debate whether these types of challenges