25 CFR § 11.313
Trial procedure
February 24, 2021
(a) The time and place of court sessions, and all other details of judicial procedure shall be set out in rules of court approved by the chief magistrate of the Court of Indian Offenses.
(b) Courts of Indian Offenses shall be bound by the Federal Rules of Evidence, except insofar as such rules are superseded by order of the court or by the existence of inconsistent tribal rules of evidence.