Extraordinary Writs Are Not a Vehicle to Relitigate Postconviction Claims; Repetitive Filings May Prompt a Filing Injunction

1. Introduction

In the Matter of the Petition of Michael T. Washington for a Writ of Mandamus or Prohibition (Del. Supr. Feb. 24, 2026) arises from Michael T. Washington’s attempt to invoke the Delaware Supreme Court’s original jurisdiction under Supreme Court Rule 43 to obtain extraordinary relief against the Superior Court.

Washington is serving a lengthy sentence following 2010 convictions for two counts of manslaughter, two counts of possession of a firearm during the commission of a felony, and (after a bench finding) possession of a firearm by a person prohibited. His convictions were affirmed on direct appeal, and he has since filed multiple unsuccessful postconviction and other collateral motions. In this proceeding, Washington sought a writ of mandamus or prohibition to compel the Superior Court to (among other things) reopen or reconsider prior postconviction rulings, hold an evidentiary hearing, address alleged counsel conflicts, and evaluate asserted newly discovered alibi evidence.

The central issues were (i) whether the stringent requirements for mandamus or prohibition were met, and (ii) whether extraordinary writ practice may be used to obtain merits review of claims already litigated—or that could have been litigated—through ordinary postconviction and appellate channels.

2. Summary of the Opinion

The Court granted the State’s motion to dismiss and dismissed the petition. It held that Washington failed to satisfy the prerequisites for either mandamus or prohibition because he did not show an arbitrary refusal by the Superior Court to perform a duty, a clear jurisdictional defect, or the absence of an adequate remedy at law. The Court emphasized that extraordinary writs cannot substitute for a properly filed appeal.

The Court also noted that it had previously warned Washington (in 2024) that repetitive filings could lead to an injunction requiring him to seek leave before filing future appeals raising repetitive claims. The Court stated it would consider, in a separate pending appeal, whether his filings constitute an abuse of the judicial process warranting such an injunction.

3. Analysis

A. Precedents Cited

In re Bordley, 545 A.2d 619 (Del. 1988)

The Court relied on In re Bordley for Delaware’s core mandamus framework: mandamus issues only when a petitioner shows (i) a clear right to the performance of a duty, (ii) no other adequate remedy, and (iii) an arbitrary failure or refusal by the lower court to act. The Court also quoted Bordley for the limiting principle that mandamus will not be used to compel a trial court to perform a judicial function in a particular way or to dictate docket control. This precedent supplied the decisive lens through which the Court characterized Washington’s filing as an effort to force substantive reconsideration of prior rulings rather than to remedy a true refusal to act.

In re Lewis, 2007 WL 328806 (Del. Feb. 5, 2007)

In re Lewis provided the rule that an extraordinary writ cannot be used “as a substitute for a properly filed appeal.” The Court used this proposition to dispose of Washington’s attempt to repackage challenges to postconviction rulings, procedural bars, and alleged errors in the handling of motions (including how motions were characterized and timed) as mandamus/prohibition issues.

In re Smith, 2026 WL 279902 (Del. Feb. 2, 2026)

For prohibition, the Court drew from the contemporaneous articulation in In re Smith: prohibition is the “legal equivalent” of an injunction and may issue only to prevent a trial court from proceeding without jurisdiction or from exceeding jurisdiction. Smith also supplied two additional guardrails the Court applied here: (i) the alleged jurisdictional defect must be clear from the record, and (ii) prohibition will not issue where an adequate and complete remedy at law exists.

In re Hovey, 545 A.2d 626 (Del. 1988)

The Court, via In re Smith, quoted In re Hovey for the proposition that prohibition will not issue if there is another adequate remedy at law. It also relied on Hovey directly for the idea that the right to appeal a criminal conviction is generally a complete and adequate remedy to review questions presented in a criminal proceeding. This principle undercut Washington’s claim that extraordinary writs were necessary to obtain review of his underlying grievances.

Prior litigation in Washington v. State

Although not used as doctrinal authority for the writ standards, the Court cited the extensive procedural history in Washington v. State, 2011 WL 4908250 (Del. Oct. 14, 2011) and later decisions, including: Washington v. State, 2024 WL 5265275 (Del. Dec. 31, 2024), Washington v. State, 2024 WL 834777 (Del. Feb. 27, 2024), Washington v. State, 2022 WL 4088664 (Del. Sept. 6, 2022), Washington v. State, 2022 WL 1041267 (Del. Apr. 7, 2022), and Washington v. State, 2017 WL 1573119 (Del. Apr. 28, 2017). This history supported the Court’s characterization of the petition as repetitive and as an attempt to relitigate matters that were, or could have been, presented through ordinary review mechanisms.

B. Legal Reasoning

1. Mandamus failed because Washington did not show an “arbitrary refusal or failure to act.” The Court treated Washington’s complaints (procedural bars, characterization of motions as successive, denial of a Rule 33 request due to timing, alleged conflict of postconviction counsel, and disagreement with the authorities relied upon in an illegal-sentence ruling) as disputes with how the Superior Court decided matters—rather than evidence that the court refused to act at all. Under In re Bordley, mandamus cannot be used to dictate judicial outcomes or docket management.
2. The petition impermissibly sought substitute appellate review. By asking the Supreme Court to direct merits review of prior motions and to order an evidentiary hearing, Washington was asking the Court to use extraordinary-writ jurisdiction to perform functions ordinarily handled by postconviction process and appellate review. In re Lewis squarely foreclosed that approach.
3. Prohibition failed because there was no clear jurisdictional defect and adequate remedies existed. Under In re Smith, prohibition addresses jurisdictional excess or absence. The Court found the Superior Court plainly had jurisdiction over Washington’s crimes and that Washington did not establish the absence of adequate remedies to litigate or appeal the challenged rulings. In re Hovey reinforced that, generally, appeal is an adequate remedy in criminal matters.
4. Repetitive litigation concerns framed the Court’s closing warning. Without entering an injunction in this order, the Court expressly referenced prior warnings and signaled it would consider, in a pending appeal, whether Washington’s pattern of filings warrants an injunction requiring leave of Court for future repetitive appeals. This reflects the Court’s interest in protecting judicial resources while preserving access to courts for non-frivolous claims.

C. Impact

• Reinforcement of strict gatekeeping for Rule 43 extraordinary writs. The decision underscores that extraordinary writ practice is not an alternate forum for postconviction merits review. Petitioners must show the specific writ elements—especially the lack of adequate legal remedies and, for mandamus, an arbitrary refusal to act; for prohibition, a clear jurisdictional defect.
• Practical guidance for litigants challenging postconviction rulings. Claims of misapplied procedural bars, mischaracterization of filings as successive, timing rulings, or dissatisfaction with the authorities a lower court used are paradigmatic issues for appeal/postconviction proceedings—not extraordinary writs.
• Signal toward filing injunctions for repetitive claims. The Court’s explicit reference to prior warnings and its stated intention to consider an injunction in a pending appeal may influence future litigants: repetitive, duplicative filings may trigger pre-filing screening mechanisms, especially where the record shows a long history of unsuccessful, overlapping collateral attacks.

4. Complex Concepts Simplified

Extraordinary writ (Rule 43)

A rare, exceptional remedy in which the Supreme Court acts in its original jurisdiction. It is not a normal appeal and is reserved for situations where ordinary legal routes cannot provide effective relief.

Writ of mandamus

An order compelling a lower court to perform a duty it is required to perform—typically used when the lower court has arbitrarily refused to act. It is not used to force a particular result or to redo merits decisions.

Writ of prohibition

An order preventing a lower court from acting without jurisdiction or beyond its jurisdiction. It does not correct ordinary legal errors when appeal or other remedies exist.

Procedural bar / successive postconviction motion

Postconviction systems often limit repeated attempts to relitigate the same conviction. A “successive” motion is a later postconviction motion filed after earlier ones; procedural rules may bar it unless narrow exceptions are met.

Adequate remedy at law

If a claim can be addressed through standard procedures—such as a direct appeal, a properly filed postconviction motion, or an appeal from the denial of such motions—extraordinary writs are generally unavailable.

Filing injunction (leave-to-file requirement)

A court order restricting a litigant from filing further repetitive matters without first obtaining permission from the court, used to curb abuse of the judicial process while preserving access for potentially meritorious claims.

5. Conclusion

The Delaware Supreme Court dismissed Washington’s petition because it sought to use mandamus or prohibition to obtain substantive reconsideration of postconviction and related rulings—relief that must be pursued, if at all, through ordinary postconviction practice and appeals. Applying In re Bordley, In re Lewis, In re Smith, and In re Hovey, the Court reaffirmed that extraordinary writs are tightly confined to cases involving an arbitrary refusal to act (mandamus) or clear jurisdictional overreach without adequate legal remedies (prohibition). The order’s final note—pointing toward a possible filing injunction in light of repetitive claims—signals the Court’s willingness to deploy protective measures when serial litigation threatens to substitute for finality and orderly appellate review.