Rule 16 Discovery Orders to Nonparties Require Personal Jurisdiction Through Proper Service

Case: People v. Castorena, 2026 CO 2 (Colo. Jan. 12, 2026) (No. 25SA179)  |  Court: Colorado Supreme Court (en banc)  |  Posture: Original proceeding under C.A.R. 21

1. Introduction

People v. Castorena arises from a cross-district discovery dispute tied to the statewide “Missy Woods” forensic scientist investigation. Juan Manuel Castorena was previously convicted of first degree murder in the Seventeenth Judicial District. The court of appeals vacated that conviction and remanded for a new trial. While the appeal was pending, the Colorado Bureau of Investigation disclosed that former forensic scientist Yvonne “Missy” Woods was under internal affairs and criminal investigation for anomalies in DNA lab work. The First Judicial District Attorney’s Office later charged Woods with numerous crimes in an ongoing prosecution.

Because Woods had testified at Castorena’s first trial, Castorena sought discovery concerning the Woods investigation and prosecution. The Seventeenth Judicial District Attorney (“17th DA”) was prosecuting Castorena; the First Judicial District Attorney (“1st DA”) was prosecuting Woods. Castorena asked the trial court to order the 1st DA (a nonparty to Castorena’s criminal case) to disclose the Woods investigative file. The core issues before the Supreme Court were:

  • Whether Crim. P. 16(I)(c)(2) authorizes a trial court to order a nonparty governmental entity to produce discovery to a defendant; and
  • If so, whether such an order is enforceable absent personal jurisdiction over the nonparty, and what procedures establish that jurisdiction.

2. Summary of the Opinion

The Court held that a trial court may issue discovery “subpoenas or orders” to “other governmental personnel” under Crim. P. 16(I)(c)(2), but such orders are enforceable only if the court first obtains personal jurisdiction over the nonparty through proper service of process.

Because Castorena did not properly serve the 1st DA, the trial court lacked personal jurisdiction over it. The discovery order compelling the 1st DA to disclose its “complete investigative criminal file” was therefore void. The Court made the rule to show cause absolute, vacated the order, and remanded. If proper service occurs on remand, the trial court must then address whether the requested materials are discoverable and should apply the Spykstra framework.

3. Analysis

3.1 Precedents Cited

Original jurisdiction under C.A.R. 21 and reviewability

  • People v. Maes: Reiterates C.A.R. 21 is extraordinary and discretionary; supports taking the case where no adequate remedy exists.
  • People v. Owens: Quoted via Maes for the limited purpose/availability of original proceedings.
  • Griffith v. SSC Pueblo Belmont Operating Co.: Personal-jurisdiction challenges are apt for C.A.R. 21 because forced appearance can be irreparable.
  • Solliday v. Dist. Ct.: Conventional appeal can be inadequate when jurisdictional harm is irreparable.
  • People v. Chavez: De novo review for whether a trial court exceeded its legal authority.

Limits on criminal discovery and trial-court authority

  • People v. Silva-Jaquez and People v. Kilgore: No freestanding discovery authority; court-ordered discovery must be rooted in constitution, statute, or rule; inherent authority cannot expand Rule 16.
  • People in Int. of E.G.: Interprets Rule 16 disclosure duties and emphasizes the lack of a broad right to use court powers as investigative tools; cites United States v. Bagley for material exculpatory evidence principles.
  • People v. Dye: Reaffirms trial courts may not surpass Rule 16 limits.

“Prosecution team” scope and district attorneys as distinct entities

  • People v. Taylor: A district attorney’s authority is geographically limited; supports treating the 1st DA and 17th DA as distinct offices, not one “prosecution.”

Jurisdiction concepts and the necessity of personal jurisdiction over nonparties

  • In re People in Int. of S.A.: Defines subject matter vs. personal jurisdiction; “without personal jurisdiction” a court is “powerless to proceed” (quoting Ruhrgas AG v. Marathon Oil Co.).
  • People v. Sprinkle, Strepka v. People: District courts have broad subject matter jurisdiction in criminal matters, but that does not confer personal jurisdiction over nonparties.
  • United Bank of Boulder, N.A. v. Buchanan and ReMine ex rel. Liley v. Dist. Ct.: Subject matter jurisdiction does not automatically supply personal jurisdiction over nonparties.
  • Nickerson v. Network Sols., LLC: A judgment is void if personal jurisdiction is lacking (used by analogy for void orders).

Service of process as the gateway to personal jurisdiction

  • Sebastian Holdings, Inc. v. Johansson: Valid service of process is a prerequisite to personal jurisdiction.
  • Minshall v. Johnston: Nonconforming service under C.R.C.P. 4 results in no personal jurisdiction and a void judgment.
  • Colorow Health Care, LLC v. Fischer: Jurisdictional triggers require strict compliance (supporting formal service requirements).
  • Gilford v. People: Personal jurisdiction defects can arise from departures in notice/service procedures.
  • Weber v. Williams: Actual knowledge does not substitute for valid service of process.
  • Delta Cnty. Mem'l Hosp. v. Indus. Claim Appeals Off.: A nonparty may specially appear to contest personal jurisdiction without waiving it.

How Rule 16 orders interact with other rules (subpoenas, construction, and gaps)

  • People v. Arellano-Avila: Rules read in pari materia; recognizes subpoena constraints; supports using other rules to fill procedural gaps.
  • People v. Baltazar and People v. Spykstra: Rule 17 subpoenas are limited; not investigative tools; Spykstra sets the five-factor test preventing “fishing expeditions.”
  • People v. Spykstra: Also supports pretrial production of materials to facilitate trial but within limits.
  • People v. Rodriguez-Morelos: Used for the anti-superfluity principle (“orders” must mean something distinct from “subpoenas”).
  • Hobbs v. City of Salida: Series-modifier canon applied to read “suitable” as modifying both “subpoenas” and “orders.”

Doctrinal synthesis: The Court uses the “no freestanding criminal discovery” line (Kilgore, Silva-Jaquez, Dye) to confine Rule 16; uses jurisdiction cases (S.A., Sprinkle, Buchanan, Sebastian Holdings) to require valid service; and uses subpoena jurisprudence (Spykstra, Baltazar) to ensure Rule 16(I)(c)(2) orders do not become an end-run around limited criminal discovery.

3.2 Legal Reasoning

A. Rule 16(I)(c) provides authority—but only within jurisdictional limits

The Court starts from the premise that Colorado criminal discovery is purely rule-/statute-/constitution-based. Under Crim. P. 16(I)(a), prosecutors must disclose specified materials in their “possession or control,” including exculpatory information. When requested items are not within that possession or control, Crim. P. 16(I)(c)(1) requires the prosecutor to use “diligent good faith efforts” to obtain materials held by “other governmental personnel.”

Crucially, Crim. P. 16(I)(c)(2) then authorizes the trial court to “issue suitable subpoenas or orders” to cause production—but only if the prosecutor’s efforts fail and the materials or personnel are “subject to the jurisdiction of the court.” The Court reads this “jurisdiction” condition to mean that enforceable compulsion against a nonparty requires personal jurisdiction, not merely the court’s broad criminal subject matter jurisdiction.

B. The 1st DA is not part of the “prosecution” in Castorena’s case

Applying Crim. P. 16(I)(a)(3), the Court rejects the notion that the 1st DA’s Woods prosecution file was within the 17th DA’s “possession or control.” District attorneys are separate constitutional officers limited to their districts; they are not a monolithic statewide prosecution office. The record also showed the 1st DA did not participate in investigating Castorena. Therefore, the 1st DA’s file could be sought, if at all, only under the “other governmental personnel” pathway of Crim. P. 16(I)(c).

C. “Orders” under Rule 16 require service to establish personal jurisdiction; gaps are filled by Rule 57(b) and civil service rules

The Court’s core doctrinal move is procedural: Rule 16 authorizes “orders,” but does not supply a service mechanism. The Court reasons that omissions in Rule 16 are not invitations for trial courts to improvise beyond authorized bounds (Kilgore), but the criminal rules themselves contain a gap-filling tool: Crim. P. 57(b). If no criminal procedure is prescribed, courts “shall look to the Rules of Civil Procedure.”

  • If the court uses a subpoena, then Crim. P. 17 governs issuance and service, supplying a clear jurisdictional hook.
  • If the court uses an order compelling a nonparty, then personal jurisdiction must be obtained through proper service of process under C.R.C.P. 4.

The Court thus recognizes Rule 16(I)(c)(2) “orders” as valid instruments, but only after the nonparty is brought within the court’s personal jurisdiction through formal service consistent with civil procedure.

D. “Suitable” limits both subpoenas and orders; Rule 16 cannot become an investigative device

The Court emphasizes that any subpoena or order under Rule 16(I)(c)(2) must be “suitable,” and it uses interpretive principles to apply “suitable” to both nouns (“subpoenas” and “orders”). The practical consequence is that courts must prevent defendants from using a Rule 16 order as a substitute for expansive investigation. The Court signals that trial courts should apply the constraints developed in People v. Spykstra—especially the five-factor test designed to ensure requests are specific, evidentiary, not otherwise procurable, necessary for trial preparation, and not a “fishing expedition.”

E. Inherent authority does not cure lack of service or expand discovery

Castorena argued that inherent authority to manage cases and enforce orders supports the discovery order. The Court rejects this on two levels:

  • Substantive limit: inherent authority cannot expand discovery beyond constitutional/statutory/rule authorization (Silva-Jaquez, Kilgore).
  • Jurisdictional limit: inherent authority enforces only lawful orders; absent personal jurisdiction, the court cannot enter binding orders against a nonparty (S.A.).

F. Application to the facts: notice was not service; special appearance preserved the objection

The defense emailed and mailed the order, but the Court holds that knowledge of an order’s existence is not a substitute for valid service (Weber v. Williams). The 1st DA’s special appearance did not waive objections and did not confer jurisdiction (Delta Cnty. Mem'l Hosp.). Because service was not properly effectuated, the order was void for lack of personal jurisdiction.

3.3 Impact

Immediate procedural impact in Colorado criminal practice

  • Two-step requirement for Rule 16(I)(c)(2) compulsion against nonparties: (1) authority under Rule 16; (2) personal jurisdiction via proper service.
  • Clarifies service pathways: a court can compel “other governmental personnel” via either (a) Rule 17 subpoena service, or (b) Rule 16 order plus C.R.C.P. 4 service.
  • Raises the cost of informal inter-agency discovery: defense counsel (and potentially prosecutors) must treat cross-entity discovery as a jurisdictional event, not a cooperative exchange.

Substantive discovery impact (especially “Missy Woods” litigation)

  • Nonparty DA offices may be compelled under Rule 16(I)(c)(2), but only through formal service—important where multiple DA offices hold different pieces of a statewide forensic controversy.
  • Constrains “file-wide” requests: the Court’s repeated insistence on “suitability” and its direction to apply Spykstra factors will likely narrow broad demands for entire investigative files.
  • Incentivizes structured motion practice: parties should expect motions to quash, in camera review requests, protective orders, and narrower tailoring (e.g., categories tied to impeachment, chain-of-custody, validation studies, internal affairs findings, etc.).

Institutional impact: separation of offices and uniform administration

  • Reinforces the independence of each district attorney’s office for “possession or control” analysis; cross-district files are not automatically imputable.
  • Promotes statewide uniformity by channeling nonparty compulsion through known service rules rather than ad hoc case-management orders (Silva-Jaquez).

4. Complex Concepts Simplified

  • Crim. P. 16(I)(c): A mechanism for obtaining discoverable materials held by “other governmental personnel” when the prosecutor does not have them. The prosecutor must try in “diligent good faith” to get them; if that fails, the court may issue a “suitable” subpoena or order.
  • “Possession or control” (Rule 16): Not merely physical custody. It can include materials held by the prosecutor’s staff or those who participated in investigating the defendant’s case and report to the prosecutor. The Court held another judicial district’s DA office is not automatically within that circle.
  • Subject matter vs. personal jurisdiction: Subject matter jurisdiction is the court’s power to hear the type of case (criminal cases generally). Personal jurisdiction is power over a specific person/entity. Even a criminal court with broad subject matter jurisdiction cannot bind a nonparty without personal jurisdiction.
  • Service of process: The formal method of delivering legal notice that confers personal jurisdiction. Informal notice (email, mail, actual knowledge) does not necessarily satisfy service requirements.
  • Special appearance: A limited appearance to contest jurisdiction without submitting to the court’s authority. Here it preserved the nonparty’s objection.
  • “Suitable” subpoena/order & the Spykstra test: A safeguard against broad, speculative requests. The requesting party must show specificity, relevance, unavailability through due diligence, necessity to avoid trial delay, and good faith (not a fishing expedition).
  • Void order: If a court acts without personal jurisdiction, its resulting order has no legal force and must be vacated.

5. The Dissent (Justice Gabriel) and the Waiver Dispute

Justice Gabriel agreed with the majority’s central architecture: Rule 16(I)(c)(2) can authorize an order to “other governmental personnel,” and service is necessary to establish personal jurisdiction. The dissent’s disagreement was narrower: whether the 1st DA had effectively waived any objection to the manner of service because it never challenged the mode of delivery (email and regular mail), actually received the order, and litigated only the broader jurisdictional theory (order vs. subpoena).

The majority treated formal service as a strict prerequisite that was not satisfied and not waived by a special appearance. The dissent viewed the majority’s approach as elevating form over substance and likely causing delay by requiring re-service under C.R.C.P. 4(e), after which the case would return to the same merits dispute (production scope under Spykstra).

6. Conclusion

People v. Castorena establishes a clear, enforceable rule for Colorado criminal discovery practice: a trial court may compel “other governmental personnel” under Crim. P. 16(I)(c)(2) through “suitable subpoenas or orders,” but it may enforce such compulsion only after obtaining personal jurisdiction over the nonparty through proper service (via Crim. P. 17 for subpoenas or C.R.C.P. 4 for orders). Informal notice is not enough, and absent proper service, the order is void.

The decision simultaneously preserves a pathway for defendants to reach critical government-held materials (including cross-district DA files) while reinforcing structural limits: Rule 16 cannot be expanded by inherent authority, and “suitable” compulsion must be cabined to avoid investigative fishing expeditions—signaling that, on remand, courts should apply the Spykstra constraints when deciding the scope of any compelled production.