Prohibition Unavailable to Collaterally Review CPL 245.80 Evidence-Preclusion Sanctions Within Trial-Court Authority

I. Introduction

Matter of Rocah v McCarthy (2026 NY Slip Op 03967 [2d Dept June 24, 2026]) addresses the boundary between (i) correctable legal error made in a criminal case and (ii) the “arrogation of power” that justifies the extraordinary Article 78 remedy of prohibition.

The petitioner, Miriam E. Rocah (then Westchester County District Attorney), brought a CPLR article 78 proceeding in the nature of prohibition seeking to block enforcement of New Rochelle City Court orders—most importantly, a January 14, 2022 order in People v Molina precluding the People from calling a New York State trooper and using evidence obtained by that trooper as a discovery sanction under CPL former 245.80(1)(a).

The key issue on appeal was narrow but consequential: whether a City Court’s preclusion of evidence as a sanction under CPL former 245.80(1)(a)—even if predicated on an incorrect finding of “prejudice”—is an excess of power remediable by prohibition, or merely an error of law that cannot be collaterally attacked through prohibition.

II. Summary of the Opinion

The Second Department held that, on these facts, a writ of prohibition does not lie. Because CPL former 245.80 authorized the trial court to determine prejudice and to impose preclusion as a sanction, any mistake in the prejudice analysis was, at most, an error of law within the court’s authorized function, not an “unlawful use or abuse of the entire action or proceeding.”

Procedurally, the court also dismissed as academic the appeal relating to the April 4, 2022 order in People v Serrano, reversed the Supreme Court’s grant of prohibition as to the January 14, 2022 People v Molina order, denied that branch of the petition, and dismissed that portion of the proceeding.

III. Analysis

A. Precedents Cited

1. The modern framework for prohibition

  • Matter of Brown v Blumenfeld, 103 AD3d 45: Quoted for the strict availability of prohibition—reserved for rare circumstances involving an “arrogation of power”—and for the principle that prohibition may address a court acting without jurisdiction or exceeding authorized powers.
  • Matter of State of New York v King, 36 NY2d 59: Central to the decision. It supplies (i) the policy against “appellate proliferation” in criminal matters, (ii) the rule that nonappealability does not itself justify collateral prohibition review, and (iii) the critical distinction between an unlawful abuse of the entire proceeding and an unlawful procedure/error within a proceeding.
  • Matter of Rush v Mordue, 68 NY2d 348: Cited (via Matter of Brown v Blumenfeld, 103 AD3d 45) for the “rare circumstances” standard; also cited for an example where prohibition was available (raising a claim of immunity from prosecution), illustrating the kind of threshold defect prohibition can address.
  • Matter of Holtzman v Goldman, 71 NY2d 564: Provides the two-tiered approach—(1) whether prohibition lies as a type of claim; and if so (2) whether the court should exercise discretion to grant it. Also cited for the point that nonreviewability by appeal does not alone warrant prohibition.

2. Distinguishing “legal error” from “excess of power”

  • La Rocca v Lane, 37 NY2d 575: The canonical warning that prohibition is not a vehicle for correcting errors of procedure or substantive law; it targets true excesses of power.
  • Matter of Steingut v Gold, 42 NY2d 311: Cited to illustrate prohibition’s proper role when the “very jurisdiction and power of the court are in issue.”
  • Matter of Brown v Blumenfeld, 89 AD3d 94: Used to support the proposition that where a court is authorized to make a determination (there, and here, concerning preclusion issues), an erroneous outcome is not necessarily an excess of power. The opinion also references Matter of Brown v Blumenfeld, 103 AD3d 45, as an example where prohibition can lie when preclusion is imposed without specific statutory authority as a generalized sanction.

3. Criminal-appeal limits and legislative policy

  • People v Coulibaly, 198 AD3d 84 and People v Stevens, 91 NY2d 270: Cited for the “fundamental rule” that the People have no criminal appeal absent statutory authorization—underscoring why prohibition cannot become an end-run around the Legislature’s limits.

4. Discovery-sanction cases about “prejudice” (but not prohibition)

  • People v Neustadt, 221 AD3d 618 and People v Ramjattan, 219 AD3d 1348: Cited to show that, on direct review (where available), courts evaluate whether the party seeking relief demonstrated “prejudice” from late disclosure; but neither case suggests that a trial court “exceeds its authority” for prohibition purposes by making a mistaken prejudice finding.
  • Matter of Clegg v Rounds, 222 AD3d 112: Heavily relied on for the key move in the court’s reasoning: if the statute authorizes the court to make the determination and choose among enumerated sanctions, a mistake is legal error, not an “arrogation of power” remediable by prohibition.

5. Cases petitioner invoked as “arrogation of power” (distinguished)

The court distinguished a line of decisions where prohibition was appropriate because the trial-level action affected the entire proceeding in a way the court lacked authority to do:

  • Matter of Soares v Herrick, 20 NY3d 139 (improper disqualification of a district attorney).
  • Matter of Holtzman v Goldman, 71 NY2d 564 (nonappealable dismissal on the merits where no evidence was presented).
  • Matter of Clark v Newbauer, 148 AD3d 260 (erroneous preclusion based on collateral estoppel affecting the entire proceeding).
  • Matter of Green v DeMarco, 87 AD3d 15 (joint suppression hearing/trial in violation of statute).
  • Matter of Cosgrove v Ward, 48 AD3d 1150 (preclusion where there was no statutory authority for that remedy).
  • Matter of Mollen v Mathews, 269 AD2d 42 (incapacitated-person determination contrary to statute).
  • Matter of Brown v Schulman, 244 AD2d 406 (preclusion order entered beyond authority in the context presented).

The Second Department’s message is that these authorities do not convert every severe or outcome-determinative trial ruling into “arrogation of power.” The decisive question is whether the lower court acted within a sphere the law authorizes it to occupy at all.

B. Legal Reasoning

1. The “type of claim” threshold: prohibition does not lie here

Applying the first tier of Matter of Holtzman v Goldman, the court asked whether the complaint is of the kind prohibition can reach. Under Matter of State of New York v King and La Rocca v Lane, the line is between:

  • Correctable legal error within jurisdiction (not reachable by prohibition), and
  • Unlawful use or abuse of the entire proceeding / true excess of authorized power (potentially reachable).

2. CPL former 245.80 gave the City Court authority to do exactly what it did (as a category)

The court emphasized the statutory structure of CPL former 245.80(1)(a) and CPL former 245.80(2). Former 245.80(1)(a) required an “appropriate remedy or sanction” when belated disclosure caused “prejudice,” and former 245.80(2) expressly included preclusion among available sanctions.

Because the statute empowered the trial court to (i) determine prejudice and (ii) select preclusion as a sanction, the City Court did not exceed its authorized powers merely by making the wrong call. Even if the prejudice finding were “egregiously” wrong, it remained an error in the exercise of an authorized adjudicative function.

3. “Prejudice” is a legal determination; a mistake does not negate authority

The petitioner framed “prejudice” as a “necessary precursor” such that absence of prejudice stripped the court of power. The Second Department rejected that characterization for prohibition purposes: prejudice is not a jurisdictional gate; it is a legal standard the court is empowered to apply. A mistaken application does not transform the ruling into an ultra vires act.

4. “Tantamount to dismissal” does not change the prohibition analysis

The petitioner argued that precluding the arresting trooper and all related evidence was effectively case-ending. The court assumed arguendo that the order might have that practical effect but held that functional severity does not convert an authorized sanction into an “arrogation of power.” The remedy of prohibition cannot be triggered simply because an interlocutory ruling is devastating to the People’s prosecution.

5. Nonappealability cannot be used to manufacture prohibition review

The People lacked an appeal as of right from a CPL 245.80 preclusion order under the version of CPL 450.20 then in effect. The court treated this as a policy-sensitive point but reiterated Matter of State of New York v King: “nonreviewability by way of appeal alone” is not enough to justify prohibition.

The court buttressed this by reference to the Legislature’s later amendment to CPL 450.20 (authorizing an appeal as of right only from the portion of an order that dismisses an accusatory instrument under CPL 245.80[2]). That targeted amendment underscored that the Legislature considered and limited the People’s appellate options; courts should not expand reviewability by re-labeling legal error as “excess of power.”

C. Impact

1. Doctrinal impact: a tighter channel for prohibition in discovery-sanction disputes

The decision clarifies that when a criminal court imposes a discovery sanction explicitly authorized by CPL 245.80 (including preclusion), prohibition generally will not lie merely because the court allegedly misapplied the “prejudice” requirement. Litigants must distinguish between:

  • sanctions imposed without statutory authority (more plausibly “arrogation of power”), and
  • sanctions imposed under an authorizing statute (even if arguably erroneous).

2. Practical impact: limited interlocutory correction of severe preclusion orders against the People

The opinion recognizes a structural consequence: preclusion orders may be practically dispositive yet still not appealable and not reachable by prohibition. This reinforces trial-level stakes in CPL article 245 litigation and may encourage:

  • more robust record-making on “prejudice” and proportionality at the trial level,
  • strategic use of continuances and alternative remedies before seeking/ordering preclusion, and
  • legislative (not judicial) solutions if broader review is desired.

3. Separation-of-powers and criminal-procedure policy

By anchoring the analysis in Matter of State of New York v King and the limited appeal rights in CPL 450.20, the decision advances the institutional policy that appellate review in criminal cases is primarily a legislative design, and extraordinary writs should not become routine corrective tools for interlocutory trial rulings.

IV. Complex Concepts Simplified

  • Article 78 “prohibition”: A rare court order stopping a lower court from acting where it lacks power to act (or is using power in a way that amounts to an abuse of the entire proceeding), not a standard appeal-like mechanism.
  • “Arrogation of power”: More than being wrong. It means acting outside the kind of authority the court is allowed to exercise—e.g., imposing a remedy the law does not permit or taking an action that unlawfully commandeers the proceeding.
  • “Preclusion”: A sanction that bars a party from introducing specified evidence or testimony at trial.
  • “Prejudice” (in discovery sanctions): A showing that the late disclosure harmed the party’s ability to litigate (for example, by impairing trial preparation or strategy).
  • “Academic”: Moot—no live controversy remains for the appellate court to resolve as to that portion of the case.
  • Impeachment evidence: Information used to challenge a witness’s credibility (not necessarily directly proving the charged conduct).

V. Conclusion

Matter of Rocah v McCarthy establishes a clear practical rule for New York criminal practice: where a trial court imposes an evidence-preclusion sanction pursuant to the authority granted by CPL former 245.80(1)(a) and CPL former 245.80(2), an allegedly incorrect “prejudice” finding is treated as error of law, not an excess of power remediable through Article 78 prohibition.

The decision reinforces the narrow scope of prohibition, the policy against interlocutory appellate proliferation in criminal cases, and the Legislature’s primacy in defining when the People may appeal discovery-sanction rulings.