Extraordinary Remedies and Intervention in Criminal Proceedings

Overview

A contested ruling during a criminal trial, an administrative decision restricting a prisoner’s liberty and an organization’s wish to address an appeal raise different procedural problems. The first concerns supervision of a court’s authority. The second concerns the legality of a deprivation of liberty. The third concerns participation in litigation that already belongs to other parties. Choosing a procedure requires identifying the decision, the applicant’s relationship to it and the precise order sought.

An extraordinary remedy (recours extraordinaire) does not create a general opportunity to interrupt a prosecution whenever a ruling appears wrong. Criminal appeals depend on legislation, and the supervisory remedies have limits of their own. This lesson concerns Canadian criminal proceedings conducted in Quebec. Provincial penal proceedings and other specialized regimes require their own statutory analysis. Read the ordinary appeal lesson alongside this one when a conviction, acquittal or sentence is being challenged.

Learning Objectives

• Distinguish supervisory review, a liberty challenge and an ordinary criminal appeal.
• Identify the applicant, threshold, procedural steps and available result for the proposed remedy.
• Explain the limits on intervention and distinguish permission to participate from constitutional notice.

Identify the action and the person seeking it

Start with a concrete conclusion: quash an identified decision, prevent an unauthorized step, require performance of a duty, correct unlawful confinement or present submissions in an existing proceeding. The conclusion helps identify the appropriate route, but its wording cannot manufacture jurisdiction.

Certiorari concerns review of an existing decision. Prohibition is directed at preventing an unauthorized proceeding or step. Mandamus concerns performance of a legal duty, including a refusal to exercise jurisdiction. Asking a judge to exercise jurisdiction differs from demanding a particular favourable result within the judge’s discretion. Habeas corpus addresses an unlawful deprivation of liberty. These remedies each require their own foundation; alleging unfairness does not make them interchangeable.

The Criminal Code recognizes these forms of relief in Part XXVI, including through section 774. Recognition of a remedy does not establish that every claimant can use it against every court. Identify whether the applicant is the accused, the prosecutor or a third party, whether the decision is interlocutory or final for that person, and whether legislation supplies an appeal or review mechanism addressing the complaint.

Participation is a separate objective. A person asking to assist an appellate court through legal submissions seeks a role in that appeal. A person seeking to quash an order directly affecting their own interests seeks relief against the order. The same organization might encounter both situations, but permission to argue in someone else’s case does not itself confer a right to overturn a separate decision.

The limited opening for certiorari

Parties, third parties and the court that decided

An interlocutory decision (décision interlocutoire) often resolves a contested issue while the criminal trial continues. In R. v. Awashish, 2018 SCC 45, the Supreme Court explained that certiorari cannot become a general interlocutory appeal for the accused or the prosecutor. For those parties, review of a provincial court judge’s ruling requires a jurisdictional error (erreur de compétence). A mistake in applying the law while deciding a matter within the judge’s authority ordinarily does not meet that threshold.

The distinction depends on the nature of the error. Acting without legal authority, failing to comply with a mandatory statutory requirement affecting jurisdiction or breaching natural justice may qualify. Merely describing an unfavourable evidentiary ruling as jurisdictional does not. At a preliminary inquiry, for example, a complete absence of evidence on an essential element can raise a jurisdictional problem; an invitation to reassess the weight of existing evidence does not serve the same function.

Awashish also distinguishes a third party whose interests are finally determined by an order. Certiorari may then address a jurisdictional error or an error of law apparent on the face of the record, provided the decision is final and conclusive for that third party. An ongoing prosecution does not necessarily make a publication restriction interlocutory for a media organization bound by it. The organization must still establish the relevant review ground and entitlement to relief.

This remedy does not lie against a superior court. Nor does the broader administrative-law discussion of reasonableness create an additional route around Awashish for parties challenging a provincial criminal ruling. The Supreme Court left open a proposed exception involving irreparable infringement of fundamental rights and no effective appellate remedy; the unresolved possibility must not be treated as an established entitlement (paras. 20–21).

Worked example: disputed disclosure during a trial

Factual Scenario

In this hypothetical adult prosecution before a provincial court judge, the defence requests additional police notes concerning warehouse surveillance. The judge hears both parties and makes a disclosure order. The prosecutor believes the judge applied the wrong legal burden and wants the Superior Court to quash the order immediately. Assume the judge had authority to decide disclosure, both sides had a fair opportunity to be heard and no separate statutory interlocutory appeal applies.

Variation

A separate order by the provincial court judge finally restricts a media organization’s publication rights. The organization seeks review of an alleged error of law apparent on the face of the record.

Test the legality of a deprivation of liberty

The applicant’s threshold and the authority’s burden

Habeas corpus can protect residual liberty (liberté résiduelle) even when the underlying sentence remains lawful. Mission Institution v. Khela, 2014 SCC 24, explains the sequence: the applicant establishes a deprivation of liberty and raises a legitimate ground questioning its legality. The burden then moves to the detaining authority to justify the deprivation (para. 30). The applicant does not obtain release simply by filing an application or expressing dissatisfaction with prison conditions.

The challenged deprivation must be identified accurately. A transfer to a more restrictive institution may engage a prisoner’s remaining liberty. Relief from that unlawful change can mean return to the previous conditions of confinement, while the lawful sentence continues. Where certiorari is sought in aid of habeas corpus, it can bring the relevant record before the reviewing court; its function differs from the standalone challenge to a criminal ruling considered in Awashish.

Provincial superior courts may hear habeas applications concerning federal prisoners. The availability of Federal Court judicial review does not by itself displace that jurisdiction. Khela identifies two narrow exceptions: a statutory appeal through which a court can correct the underlying judicial decision and release the applicant if necessary, or a complete, comprehensive and expert statutory procedure reviewing the administrative decision (paras. 40–42). Subject to those exceptions, establishing the initial threshold entitles the applicant to a hearing on legality, not automatically to discharge. An administrative transfer therefore requires different reasoning from an attempt to relitigate a conviction through habeas corpus.

In the administrative confinement context, the legality inquiry may include procedural fairness and reasonableness. That does not contradict the narrow criminal certiorari rule: the subject of review, legal foundation and liberty interest differ. Identify which inquiry applies before choosing the standard.

Worked example: a transfer to more restrictive confinement

Factual Scenario

A hypothetical federal prisoner is transferred to a more restrictive institution. The sentence itself is valid, and no new judicial detention order is being challenged. The prisoner produces the transfer decision and credible evidence that information necessary to answer the stated security concern was withheld without an explained lawful basis. The prisoner seeks restoration of the previous confinement conditions.

Protect the correct procedural route

Quebec Superior Court applications

The Superior Court’s criminal rules in force since June 30, 2025 govern applications for certiorari, habeas corpus, mandamus, procedendo and prohibition. Rule 72 provides for immediate application, except in cases of inconsistency. Rules 36–40 require attention to the conclusions, parties and supporting record; filing belongs in the judicial district where the disputed facts originated. Facts outside the court record require an affidavit (déclaration sous serment). The impugned court, judge or official must be impleaded and served as required, along with the parties concerned. Written submissions are required unless the judge grants an exemption, with relevant transcript references and the judge’s timetable and directions.

Rule 37 contains two different timing requirements. The application must be brought within thirty days of the challenged decision or proceeding unless a judge extends the period. Notice of presentation must ordinarily allow at least three working days; habeas corpus requires at least two working days. A judge may shorten the presentation period for urgency. Satisfying the short notice period does not cure failure to respect the outer thirty-day limit.

Service does not produce an automatic suspension of proceedings (suspension de l’instance): rule 38 requires a judicial order. If the upcoming step would defeat the requested relief, a suspension must be sought and justified separately. A pending challenge does not authorize the parties to disregard the existing order or assume that the trial has stopped. Applications that delay or impede proceedings receive urgent treatment under rule 39.

These are rules for proceedings within their criminal scope. Rule 41 incorporates civil habeas provisions with the necessary modifications. A prison-related habeas case must still be classified under the governing jurisdiction and procedure; the criminal timetable should not be applied mechanically to every administrative detention dispute.

Appeal the right decision at the right stage

Section 784 of the Criminal Code provides appeals from decisions on extraordinary remedies within Part XXVI’s criminal scope. Grant or refusal of mandamus, certiorari or prohibition may be appealed to the court of appeal, with Part XXI applying as adapted. The habeas provisions distinguish the initial writ from the judgment after the detention has been examined:

The initial writ initiates judicial examination of the detention; it must not be equated with a final order declaring the detention unlawful. Conversely, the prohibition on appealing that initial grant does not eliminate the appeal from the later judgment on the return. Section 784(3) also prevents a renewed habeas application on the same grounds after refusal, absent fresh evidence. Section 784(6) requires an early appeal hearing, including outside prescribed court sessions. Read the actual disposition before calculating the route and deadline.

Section 776 bars removal of a conviction or order by certiorari where an appeal was taken, even if unfinished, or where the defendant appeared, pleaded, was tried on the merits and did not take an available appeal. Check these conditions before treating supervisory relief as an alternative.

Participate without taking over the case

An intervener (intervenant) can contribute expertise or a perspective that assists the court beyond the parties’ submissions. The proposed contribution must be sufficiently specific for the court to assess its usefulness and differences. General interest in criminal justice, or agreement with one party’s position, does not itself establish that another set of submissions will help.

In R. v. Barton, 2019 SCC 33, paras. 52–53, the Supreme Court emphasized the limits of this role. An intervener must not become an additional prosecutor, enlarge the appeal or introduce new issues. The accused’s fair-trial rights under Charter sections 7 and 11(d) remain central. Permission to make legal submissions does not automatically permit new evidence, examination of witnesses or participation throughout every later stage.

The court and its order define the role

Before the Quebec Court of Appeal, criminal rule 87 applies the Code of Civil Procedure and the civil appeal regulation where compatible with the Criminal Code and criminal rules. Article 187 C.C.P. requires leave for friendly intervention and consideration of the importance of the issues, particularly the public interest, and the contribution’s usefulness. Its five-day notification requirement must be read with criminal rule 53: notification or service and filing ordinarily must occur at least ten working days before presentation to the court, five before a judge and two before the clerk. The rule includes exceptions for release applications and requires reservation of a court presentation date followed by filing within five working days. Identify the proper decision-maker rather than selecting the shortest period. Rule 88 preserves earlier rules for some older appeals but expressly excepts application procedure from that preservation.

Before the Supreme Court, rules 55–59 supply a distinct motion procedure. The affidavit identifies the applicant’s interest and possible prejudice; the motion explains the position and the useful, different submissions proposed. The ordinary deadline is thirty days after filing or opening of the leave-application file for intervention at that stage, and four weeks after the appellant’s factum for intervention in an appeal. The judge can impose conditions concerning evidence, the record, costs and oral submissions. Rule 59 does not permit new issues unless a judge orders otherwise. Rule 42(3) restricts an outcome statement in Part V of the intervener’s factum unless otherwise ordered. The Court’s November 2021 intervention notice more broadly directs interveners to avoid taking a position on the appeal’s outcome in written or oral argument and to refrain from challenging findings of fact.

At trial, identify the particular court’s authority and the procedural issue. The appellate intervention rules do not automatically govern a trial court. A complainant’s or record-holder’s specific statutory participation rights also require their own analysis; they should not be reduced to an ordinary request for friendly intervention. In every forum, the order granting participation determines the permitted subject, form and extent of the contribution.

Worked example: an association seeks to intervene

Factual Scenario

A hypothetical research association seeks leave to intervene in a Quebec criminal appeal concerning an evidentiary rule. It proposes legal submissions about the rule’s practical effect, new witness accounts about the alleged offence and an argument that the accused must be guilty. Assume its legal perspective could assist the court, but the new accounts are outside the appeal record.

Keep constitutional notice separate

Constitutional notice (avis constitutionnel) gives designated public authorities the opportunity to address a constitutional issue. It serves a different function from a private organization’s motion for leave. In Quebec, articles 76–78 C.C.P. apply expressly in criminal and penal matters as well as other proceedings. Their trigger depends on the claim: challenging a rule’s validity, constitutional applicability or operability and seeking reparation from the State, a state body or a public legal person for a rights infringement do not follow identical notice requirements.

Article 77 requires service by bailiff on the Attorney General of Quebec as soon as possible and ordinarily at least thirty days before trial in a criminal or penal matter. The notice identifies the grounds and includes the pleadings already filed. Only the Attorney General may waive that period; the Attorney General becomes a party without further formality. The notice must also be served on the Attorney General of Canada if the provision or rule concerns federal jurisdiction, and notified to the Director of Criminal and Penal Prosecutions if it concerns a criminal or penal matter.

Article 78 instead requires at least ten days before the hearing on the specified reparation application, with exceptions including disclosure, exclusion of evidence and elapsed time since accusation. Late notice normally requires service and an adjournment; the Attorney General may waive the period, or the court may shorten it to avoid irreparable prejudice to the applicant or a third person. These exceptions concern that reparation route, not a separate attack on a rule’s validity or applicability. Article 76 otherwise prevents adjudication without valid notice and confines the decision to the notified grounds.

At the Supreme Court, rule 33 has its own constitutional-question notice and attorney-general intervention process. An attorney general who responds under rule 33(4) does not need ordinary leave to intervene. Neither service of a constitutional notice nor the presence of an attorney general establishes that the constitutional challenge is well founded. Identify the issue, recipients, deadline and procedural consequence independently from the merits and from any private intervention request.

Practice Checklist

• Identify the impugned decision, decision-maker, applicant and exact relief sought.
• Check statutory appeal or review routes before selecting an extraordinary remedy.
• For certiorari, distinguish parties from third parties and establish the applicable review ground.
• For habeas corpus, identify the deprivation, legitimate legality ground, burden and appropriate relief.
• Verify the current court rules, service, outer limit and presentation notice separately.
• Seek any needed suspension expressly; do not assume service stops the proceeding.
• Read the disposition before applying the criminal habeas appeal rules.
• Confine intervention to the court’s authority and permission; assess constitutional notice separately.