High court weighs whether prior jury verdict bars second commitment petition in TW case

At oral argument in the Montana Supreme Court, appellant TW urged the justices to find that claim preclusion or collateral estoppel may apply to civil‑commitment proceedings in some cases and that the district court erred by allowing the state to try a second petition on essentially the same theory after a jury had already found TW did not require commitment.

Miss Peterson argued the second petition relied on the same substantive theory — that TW was "unable to care for her basic needs" — and largely the same witnesses and evidence as the first trial. She asked the court to reconsider a line of precedents (as discussed in argument and cited variously in the record) that the state read as categorically insulating subsequent petitions from preclusion doctrines. Peterson told the court: "This jury was tasked with relitigating a prior verdict." She urged that when a later petition is based on the same theory and substantially the same evidence, preclusion doctrines should be available to protect the finality and meaning of jury judgments.

The state, represented by Assistant Attorney General Thad Guder, argued that the second petition here rested on newly discovered and compelling evidence that arose after the first trial, pointing repeatedly to approximately "40 minutes of deputy Smith's body worn camera footage." Guder said that footage and testimony about TW’s post‑trial decompensation showed she “presents as profoundly mentally ill and desperately in need of treatment,” and that the new evidence placed the second petition outside any categorical preclusion bar. Guder further urged that statutory provisions allow evidence of deterioration and predictability to be considered (discussed in argument as part of 53 21 1 26 and related subsections).

Justices asked how to reconcile respect for a prior jury verdict with the legislature’s scheme that permits later petitions when the necessary statutory criteria are met. One justice described the problem as balancing the finder of fact’s role against the possibility that a respondent may decompensate after a release; another raised concerns that introducing prior verdicts or prior‑trial evidence risks turning the second jury into a vehicle for re‑litigation rather than evaluation of genuinely new facts.

Peterson proposed limiting instructions and evidence‑screening mechanisms if a second petition proceeds, and argued the district court’s categorical pretrial ruling that preclusion was “off the table” improperly opened the door to relitigating matters the first jury had resolved. The state countered that the record here showed a precipitating event (calling 911, running from police) and later officer and hospital observations that supported the new petition and that exclusion of that post‑verdict evidence would leave responders and courts unable to address clear deterioration.

The justices pursued practical and doctrinal questions: how to define when new evidence is sufficient to avoid preclusion, whether limiting instructions and careful evidentiary rulings could reconcile competing concerns, and whether the court should maintain the line of authority that a prior civil‑commitment determination is not always a final, preclusive judgment on mental‑health status. Counsel for both sides acknowledged that the state may file subsequent petitions in appropriate circumstances; the core dispute is whether the district court in this case correctly applied preclusion doctrines and evidentiary limits.

The case was submitted after argument. The justices will decide whether, and in what circumstances, claim or issue preclusion can bar a later commitment petition and how trial courts should handle evidence from prior proceedings.