Federal Rules of Criminal Procedure - Rule 40. Arrest for Failing to Appear in Another District
(a) In General.
A person must be taken without unnecessary delay before a magistrate judge in the district of arrest if the person has been arrested under a warrant issued in another district for:
(i) failing to appear—as required by the terms of that person’s release under 18 U.S.C. §§ 3141–3156 or by a subpoena; or
(ii) violating conditions of release set in another district.
The judge must proceed under Rule 5(c)(3) as applicable.
(c) Release or Detention Order.
The judge may modify any previous release or detention order issued in another district, but must state in writing the reasons for doing so.