MEMORANDUM **

Blame Guthrie appeals the district court’s order denying her motion to dismiss the indictment and to suppress the statements she gave to National Park Service (“NPS”) Rangers during her detention. Guthrie contends the district court erred in denying her motion to dismiss the indictment and suppress her statements because the 27-hour delay between her arrest and initial appearance before a magistrate violated: (1) the Fourth Amendment; (2) the United States District Court for the Eastern District of California’s Criminal Justice Act Plan (“CJA”); and (3) Federal Rule of Criminal Procedure 5(a) (“Rule 5”) and the Mallory rule.1 We have jurisdiction pursuant to 28 U.S.C. § 1291, and we affirm.

I.

Because Guthrie’s pre-arraignment detention lasted less than 48 hours, it is presumptively constitutional under the Fourth Amendment. See County of Riverside v. McLaughlin, 500 U.S. 44, 56, 111 S.Ct. 1661, 114 L.Ed.2d 49 (1991). Guthrie presents three arguments to rebut the presumption of constitutionality.

First, Guthrie contends she was not presented to the magistrate at the first scheduled arraignment calendar following her arrest. The presentment delay occurred for constitutionally acceptable reasons. Guthrie was first booked and interviewed at the Yosemite Holding Facility. See Kanekoa v. City & County of Honolulu, 879 F.2d 607, 611-12 (9th Cir. 1989) (holding an interview is part of the “administrative steps incident to arrest” that justify delay). Further, the Rangers could not take Guthrie immediately to the magistrate following her interview because they also had to book and interview Kimberly *480Williams, who was arrested with Guthrie. See McLaughlin, 500 U.S. at 56-57, 111 S.Ct. 1661 (noting the processing of other suspects may justify delay). Finally, the only magistrate in Yosemite was unexpectedly unavailable due to a family emergency when the Rangers completed processing Williams and Guthrie. See id. (noting the unavailability of a magistrate may justify delay).

Second, Guthrie asserts the prearraignment delay was solely for the purpose of obtaining a confession from her. Nevertheless, the Rangers did not need a confession to justify Guthrie’s arrest because Guthrie does not contest the Rangers had probable cause to arrest her. See Kanekoa, 879 F.2d at 612 (holding the police did not interview the arrestees merely to build a case against them because the arrestees conceded the police had probable cause to arrest). Further, Guthrie, after being advised of and waiving her Miranda rights, confessed to the events surrounding her arrest at the beginning of the interview. That the Rangers also asked Guthrie, to establish “motive,” why she stole money from the gift shop does not mean the sole purpose of the presentment delay was to obtain a confession.

Guthrie’s contention that the NPS delayed her arraignment to question her about crimes unrelated to her arrest lacks factual support. Guthrie made unsolicited statements regarding criminal activity in Yosemite Park, even though the Rangers attempted to end the interview several times. It was not unreasonable for the Rangers to listen to Guthrie’s voluntary statements and ask follow-up questions.

Third, Guthrie asserts the pre-arraignment delay was unreasonable because NPS regulations prohibited its law-enforcement officers from arresting Guthrie for a misdemeanor under the circumstances of this case. Guthrie does not explain why the validity of her arrest under the NPS regulations can rebut the presumption that the delay between her arrest and her presentment was constitutional. Assuming, arguendo, an unconstitutional arrest can rebut the presumption that a presentment delay was constitutional, Guthrie’s arrest did not violate the Fourth Amendment. See Atwater v. City of Lago Vista, 532 U.S. 318, 323, 121 S.Ct. 1536,149 L.Ed.2d 549 (2001).

Thus, Guthrie has failed to rebut the presumption that the pre-arraignment delay was constitutional under the Fourth Amendment.

II.

Guthrie contends the district court erred in denying her motion to dismiss/suppress because the NPS violated the CJA. Within two hours of her arrest and before the NPS Rangers interviewed her, Guthrie was advised of and waived the right to have counsel appointed if she could not afford one. Further, the Federal Public Defender’s Office was notified of Guthrie’s arrest at 5:00 p.m. on the date of her an-est, and counsel was appointed for Guthrie at her first appearance before the magistrate.2 Accordingly, there was no CJA violation.3

III.

A valid Miranda waiver also waives any Rule 5/Mallory claim. See *481United States v. Howell, 470 F.2d 1064, 1067 n. 1 (9th Cir. 1972). Guthrie was advised of her Miranda rights, indicated she understood them, and signed a waiver of rights form. Guthrie does not challenge the validity of her Miranda waiver. Thus, by waiving her Miranda rights, Guthrie also waived her Rule 5/Mallory claim.

AFFIRMED.