Case Explained: Robinson v. Oglala Sioux Tribe, et al.

Court: United States Court of Appeals for the Tenth Circuit Filed: 2026-07-29 Docket: 5:25-CV-00289-D) The tenth-circuit affirmed the district court’s dismissal of Shantell Robinson’s civil complaint with prejudice as a sanction for violating Federal Rule of Civil Procedure 11(b). The court held that the district court did not abuse its discretion in finding clear and convincing evidence that Robinson engaged in sanctionable conduct, including submitting fabricated evidence, citing non-existent or hallucinated legal authority, filing excessive and frivolous motions, and sending emails containing threats of physical harm. Applying the five-factor test from *Ehrenhaus v. Reynolds*, the court determined that dismissal was warranted based on the degree of prejudice to defendants, interference with the judicial process, Robinson’s culpability, prior warnings issued by the district court, and the ineffectiveness of lesser sanctions. The court also ruled that Robinson’s remaining appellate arguments regarding pending motions were moot due to the dismissal and that she waived any challenge to tribal sovereign immunity by failing to adequately brief the issue. Consequently, the judgment in favor of all defendants stands, and Robinson is granted leave to proceed in forma pauperis. Do It For The Case Law is a news reporting service. Nothing in this episode constitutes legal advice.