25 CFR §11.118

1. (a)A Court of Indian Offenses may exercise over a Federal or State official only the same jurisdiction that it could exercise if it were a tribal court. The jurisdiction of Courts of Indian Offenses does not extend to Federal or State employees acting within the scope of their employment.
2. (b)A Court of Indian Offenses may not adjudicate an election dispute, take jurisdiction over a suit against a tribe, or adjudicate any internal tribal government dispute, unless the relevant tribal governing body passes a resolution, ordinance, or referendum granting the court jurisdiction.
3. (c)In deciding who is a tribal official, BIA will give deference to a decision of the Court of Indian Offenses, acting as a tribal forum by resolution or ordinance of a tribal governing body under paragraph (b) of this section.
4. (d)A tribe may not be sued in a Court of Indian Offenses unless its tribal governing body explicitly waives its tribal immunity by tribal resolution or ordinance.