Privilege and confidentiality in criminal proceedings

Overview

A document may be relevant, reliable and useful to a defence while remaining legally protected from disclosure. The explanation may lie in the need to preserve candid legal advice, protect a police source or permit private preparation for litigation. Each protection has its own conditions; an appeal to confidentiality alone does not identify the governing rule.

Privilege (privilège) must be considered before information is circulated or read aloud in court. A later decision excluding evidence cannot undo every consequence of revealing a client's advice or an informer's identity. The procedure for deciding a disputed claim must itself preserve the protection until the court rules.

This lesson provides a method for Canadian criminal proceedings: classify the information, establish the claim, identify any waiver or exception and select a protective procedure. The separate duties imposed on lawyers are addressed in defence counsel ethics. Access to private complainant records follows specialized rules explained in disclosure and third-party records.

Learning Objectives

• Distinguish a legal privilege from an ordinary promise or professional duty of confidentiality.
• Apply the different conditions governing legal advice, informers, litigation and other protected communications.
• Structure a challenge or exception without disclosing protected information prematurely.

Identify the protection before asking for disclosure

Confidential information does not all receive the same treatment

Confidentiality (confidentialité) describes an obligation or expectation whose legal consequences depend on its source. A private promise, professional duty and evidentiary privilege can overlap, but one does not establish all the others. A document marked confidential may still be producible; an unmarked communication may enjoy strong privilege.

A class privilege (privilège générique) applies once the conditions of a recognized category are established. The court then protects the information subject to the category's defined limits and exceptions. It does not normally start afresh by asking whether disclosure would be useful enough to justify overriding that protection. The party asserting the claim must establish its factual foundation; the category cannot be invoked merely as a label.

A case-by-case privilege (privilège au cas par cas) requires a different inquiry into the particular communications and relationship. Here a contextual balancing exercise forms part of establishing the protection itself. Confusing these approaches can either expose information that should be protected or suppress evidence without the necessary legal basis.

The first practical task is to identify what is sought. Is it the content of legal advice, the source of a tip, a lawyer's preparation notes, a settlement proposal or an ordinary witness's account? A single file may contain several categories. The physical folder and the person storing it do not decide whether every item shares the same protection.

Separate the successive questions

Use four questions in order: does the information fall within the claimed protection; who holds it; has it been validly waived; and does a recognized exception apply? A successful answer at one step does not answer the others. For example, a communication outside the scope of legal advice needs no exception to solicitor-client privilege, while a protected communication requires a proper legal basis for intrusion.

The procedural remedy also needs separate analysis. Production to a judge for protected review, production to the accused and admission at trial are different decisions. Permission to inspect a limited passage does not authorize publication of the entire file. The court's order should specify the recipient, purpose, extent and safeguards appropriate to the particular protection.

Legal advice and the client's protection

Establish the communication and its purpose

Solicitor-client privilege (privilège avocat-client) protects communications between lawyer and client seeking or giving legal advice that the parties intend to keep confidential. In R. v. Fox, 2026 SCC 4, the Supreme Court reaffirmed those conditions and the privilege's constitutional importance. A prospective client can receive protection when taking the first steps toward legal advice, before a formal retainer is completed.

The privilege encourages a person to provide the information needed for sound advice, including damaging information about past conduct. Legal advice concerning a completed offence does not lose protection merely because the client admits wrongdoing. Communications that are themselves criminal or seek to further unlawful conduct fall outside the protected professional purpose. The distinction turns on what the communication is doing, not on whether its subject is unpleasant or incriminating.

Ordinary business discussions do not become privileged simply because a lawyer participates. Conversely, a legal consultation should be assessed in its actual context rather than by isolating a harmless sentence from the exchange. The protection concerns the communications; underlying events and independently existing evidence do not become immune from investigation merely because the client discussed them with counsel.

The client holds the privilege. Waiver (renonciation) requires informed consent, express or inferred from legally sufficient conduct attributable to the holder; the lawyer cannot simply surrender it for convenience. A party who relies on legal advice as part of a position in litigation may create a waiver issue, but its existence and scope require examination. An accidental disclosure is not a safe basis for assuming unrestricted access. Celanese Canada Inc. v. Murray Demolition Corp., 2006 SCC 36, illustrates the need to contain disclosure and protect the fairness of proceedings after privileged material reaches an opponent.

The protection also governs collection of evidence. In Lavallee, Rackel & Heintz v. Canada (Attorney General), 2002 SCC 61, the Court required safeguards for law-office searches: investigators must satisfy the issuing judge that no reasonable alternative exists, potentially privileged material must be protected from premature inspection, and holders must have a reasonable opportunity to assert privilege. Documents must be sealed before examination or removal unless the warrant expressly authorizes immediate examination, copying and seizure of an identified document. The prosecution may argue the privilege question but cannot inspect the documents before a judge finds them unprivileged. These safeguards matter when investigators seize a mixed paper or electronic file.

Interception raises additional restrictions under Criminal Code ss. 186(2)–(3). Section 189(6) preserves privilege despite interception; Fox confirms that it also leaves recognized common-law exceptions available. An authorization to collect evidence therefore does not itself permit unrestricted use of confidential legal advice.

Worked example: the advice and the existing invoice

Factual Scenario

In this hypothetical, a contractor consults a criminal lawyer about an allegation of false billing. During a private meeting, the contractor explains why an invoice was altered and asks about possible liability. The contractor also hands over an original invoice created months earlier in the ordinary course of business. Police later request both the lawyer's account of the conversation and the invoice. Assume the consultation sought lawful advice, and no waiver or recognized exception has been established.

Recognized exceptions remain narrow

The privilege is close to absolute, with specific exceptions rather than a general discretion to disclose whenever a judge considers the information helpful. Public safety is one example. Smith v. Jones, [1999] 1 SCR 455, requires attention to the clarity of the risk to an identifiable person or group, the seriousness of threatened harm and its imminence. The concern is death or serious bodily harm; a vague suspicion of future wrongdoing is insufficient.

These factors are assessed together in context. Imminence involves urgency and does not always require an attack within a fixed number of hours. If the exception is established, disclosure must be confined to what is necessary to address the danger. It does not authorize release of unrelated admissions throughout the client's file.

Other recognized exceptions have different purposes. Their existence does not reduce the privilege to an unrestricted fairness balance. In a criminal case, the exceptional need to avoid a wrongful conviction requires the structured analysis below.

Innocence at stake and controlled judicial review

A last resort requires more than possible usefulness

Innocence at stake (innocence en jeu) is a stringent exception, developed in R. v. McClure, 2001 SCC 14, and clarified in R. v. Brown, 2002 SCC 32. For access to another person's privileged legal communications, the accused must first establish that the information is unavailable from another source and that there is no other way to raise a reasonable doubt. A desire for stronger corroboration or a more convenient source does not satisfy this preliminary threshold.

The two further stages serve different functions:

1. The accused must provide an evidentiary basis for concluding that a communication exists that could raise a reasonable doubt. Speculation about what a file might contain is insufficient. This determines whether the judge should examine it.
2. The judge examines the communication to decide whether it is likely to raise a reasonable doubt. If this higher requirement is met, only the necessary material is produced under appropriate safeguards.

The exception does not require the judge to decide the trial in advance. A finding that the material is likely to raise a reasonable doubt is different from a verdict of acquittal. The accused must establish each element of the application on a balance of probabilities. The Crown retains its burden of proving the charged offence beyond a reasonable doubt at trial.

Timing follows necessity. The application will ordinarily be considered after the Crown's case has revealed whether another route to reasonable doubt exists, although trial management allows the procedure to be adapted. An earlier refusal can be revisited if the evidentiary situation changes. The court must also examine whether an alleged alternative source can actually provide admissible evidence rather than assuming its availability or unavailability.

Lawyers charged with offences can invoke the procedure

Fox confirms that an accused lawyer may apply for access to their own client's privileged communications when necessary for their defence. Professional duties do not categorically bar the application, and their existence does not automatically establish that the prosecution is unfair. The lawyer must use the adapted innocence-at-stake procedure.

At the first stage, the lawyer can attest that a privileged communication exists that could raise a reasonable doubt. The court may take that representation at face value without requiring the lawyer to reveal the protected content. Before authorization, the lawyer cannot disclose that content to people outside the privilege, including their own defence counsel. The court can arrange protected review and, where appropriate, obtain assistance from independent counsel appointed to help it.

Successful production initially gives the accused and their counsel only the access necessary to raise a reasonable doubt. The Crown receives the material only to the extent that the accused relies on it at trial or during pre-trial negotiations. The privilege holder also receives use and derivative-use protection against the communications and resulting evidence being used against them in a later case. These safeguards preserve the narrow purpose of the intrusion.

Police sources and the risk of identification

Protect the identity and the identifying details

Informer privilege (privilège de l’indicateur) arises where police receive information under an express or implied promise to protect the source's identity. An implied promise depends on conduct giving the prospective informer reasonable grounds to believe anonymity is protected. An ordinary witness or a person who simply speaks to police is not automatically an informer within this category.

Once established, the privilege protects identity and information capable of revealing it. Removing the person's name may be insufficient. The mosaic effect (effet mosaïque) arises when details about timing, access or surrounding circumstances combine with what someone already knows to identify the source. The analysis must consider that combined risk.

R. v. Basi, 2009 SCC 52, and R. v. Brassington, 2018 SCC 37, explain the strength of the protection. Police, the Crown and the court must uphold it. It belongs jointly to the informer and the Crown; neither can waive it alone. The court cannot override it merely because disclosure would assist cross-examination or improve the defence generally. The sole exception is innocence at stake, subject to its stringent conditions.

An officer accused of an offence cannot circumvent the protection by privately revealing informer information to the officer's own lawyer. Nor does defence counsel's undertaking to keep information confidential put counsel within the protected relationship. A lawful procedure must precede access.

Decide the claim without defeating it

When the Crown asserts informer privilege, it must establish the confidential informer relationship on a balance of probabilities. Until that question is resolved, the process must assume that the claimed protection may apply. Basi requires exclusion of the accused and defence counsel from protected information where necessary to preserve identity, while limiting their exclusion to what is necessary.

Procedural fairness can still be supported. Counsel may make submissions about the category, suggest questions for the judge and, where safely possible, receive redacted information or a summary permitting further submissions. An independent lawyer appointed to assist the court may be appropriate. These measures support scrutiny without disclosing the very information in dispute.

Worked example: the unnamed source in a small building

Factual Scenario

In this hypothetical, police receive a confidential tip about stolen equipment stored in a building with six occupants. A draft disclosure page removes the informer's name but states the precise time of the call and describes the caller's access to a particular locked room. The accused knows that only one occupant had that access during the stated period. Assume the Crown can establish the confidential informer relationship; the defence has not established innocence at stake.

Preparation, negotiations and other confidential relationships

Litigation and settlement protect different activities

Litigation privilege (privilège relatif au litige) protects material created for the dominant purpose of pending or reasonably anticipated litigation. Blank v. Canada (Minister of Justice), 2006 SCC 39, distinguishes this protection from legal-advice privilege. It can include communications with third parties and protect self-represented litigants. Its focus is the ability to prepare a case privately.

The protection ordinarily ends with the litigation, but closely related proceedings may extend its duration. Legal-advice privilege may separately continue over material in the same file. Lizotte v. Aviva Insurance Company of Canada, 2016 SCC 52, confirms that litigation privilege is a class privilege with defined exceptions; it is not displaced by a fresh convenience balance for each document. The exceptions include public safety, innocence at stake, criminal communications and evidence of the claimant’s abuse of process or similar misconduct. For the last category, Blank requires a prima facie showing of actionable misconduct connected to the proceedings before protected material is reviewed on that ground.

Placing an otherwise producible document in a litigation file does not automatically exempt it from disclosure. In criminal proceedings, the Crown's duty to disclose relevant evidence remains distinct from protection for counsel's legal analysis and strategy. Newly learned material facts cannot simply be relabelled work product to avoid that duty. The correct separation is discussed further in the disclosure lesson.

Settlement privilege (privilège relatif aux règlements) concerns genuine efforts to resolve a dispute. Protection can apply whether negotiations succeed or fail, without requiring the words “without prejudice.” Sable Offshore Energy Inc. v. Ameron International Corp., 2013 SCC 37, explains the principle, including its application to communications resolving criminal proceedings.

The label does not create protection for every communication sent to an opponent. Nor does an established privilege prevent every use of negotiations: Union Carbide Canada Inc. v. Bombardier Inc., 2014 SCC 35, recognizes the exception for proving the existence or scope of a settlement when necessary. In a criminal file, distinguish protection of negotiations from the separate requirements governing a valid plea or enforceable resolution.

Marriage, professional communications and journalistic sources

Marriage does not make a witness incompetent or uncompellable for the prosecution: Canada Evidence Act s. 4(2) expressly rejects that rule. Section 4(3) separately protects a spouse against being compelled to disclose communications made by the other spouse during marriage. Compelling attendance and compelling an answer about a particular marital communication are therefore different questions. The protection concerns compelled disclosure by the recipient spouse, who may choose to disclose; it is not a veto held by the spouse who spoke. Observations of events should not automatically be equated with protected communications.

For a relationship without an applicable class or statutory protection, the common-law Wigmore analysis asks whether the communications were made in confidence, whether confidentiality is essential to the relationship, whether society should encourage the relationship and whether the harm from disclosure outweighs its benefit to the proper determination of the case. The claimant must establish those conditions. A promise of secrecy alone is insufficient; partial protection may sometimes meet the demonstrated need.

Specialized legislation must be checked first. Section 39.1 of the Canada Evidence Act protects information identifying or likely to identify a qualifying journalistic source. The statutory definitions require a qualifying journalist and a confidential source whose anonymity is essential to the relationship, with an undertaking not to reveal the source’s identity. The journalist may object, and the decision-maker may raise the protection independently. Information remains protected while the objection is resolved, after the parties and interested persons receive a reasonable opportunity to make submissions.

The person seeking disclosure must establish that the information cannot be produced in evidence by another reasonable means and that the public interest in the administration of justice outweighs source confidentiality. The statutory factors include its importance to a central issue, freedom of the press and the effect on the source and journalist. Protective conditions remain available. This statutory burden differs from requiring the journalist to establish every Wigmore criterion.

Public interests and the proper decision-maker

A specified interest requires a specified procedure

A public-interest objection (opposition pour des raisons d’intérêt public) may concern matters such as investigative methods, an ongoing investigation or witness-protection arrangements. The fact that information appears in a police file does not establish a blanket privilege over the file. Identify the harm disclosure would cause and the legal basis for protecting it.

Canada Evidence Act s. 37 permits the specified official objection and requires the information to remain protected while the statutory process is followed. The competent court examines the asserted public interest and, where the statutory conditions allow, may authorize full disclosure, a portion, a summary or an admission of facts with safeguards. This balancing route does not abolish the distinct near-absolute protection of an established informer privilege.

Jurisdiction matters. A superior court may decide an objection made before it. For an objection before the Court of Quebec, an application goes to the Superior Court under s. 37(3); other settings may engage the Federal Court branch. The default application period is ten days after the objection, subject to judicial shortening or extension. Under s. 37(7), an order authorizing disclosure does not take effect while the prescribed appeal opportunities remain unexhausted.

Section 37.1 directs appeals from the Federal Court to the Federal Court of Appeal, and from a provincial superior court to that province’s court of appeal. For criminal charges laid on or after August 19, 2024, an accused ordinarily must await conviction and appeal within the conviction-appeal period, subject to extension; an earlier appeal requires permission based on exceptional circumstances. Other appeals under the current provision have a fifteen-day period, subject to extension. Section 108(2) of the Countering Foreign Interference Act, SC 2024, c 16, preserves the former s. 37.1 for criminal charges laid before that date. The charge date therefore matters even if the privilege ruling occurs later. Section 37.2 separately sets ten days to seek Supreme Court leave, subject to extension.

Sections 38 and following and s. 39 contain separate schemes concerning national-security-related information and Cabinet confidences respectively. Their decision-makers and procedures must not be inferred from s. 37.

Where withheld information affects trial fairness, s. 37.3 permits protective orders consistent with the governing disclosure order, including a stay where justified. A finding of privilege does not automatically terminate the prosecution, and a fairness concern does not authorize the trial judge to disregard an existing statutory order. The remedy must respond to the established prejudice within the applicable legal framework.

Practice Checklist

• Identify the exact information, holder, legal category and factual basis of the privilege claim.
• Separate confidential advice from underlying evidence and litigation preparation from disclosable facts.
• Resolve waiver and scope before deciding whether an exception is needed.
• For innocence at stake, establish alternative-source unavailability and the absence of another route to reasonable doubt before the two-stage inquiry.
• Examine identifying combinations when redacting informer information.
• Verify the current statutory scheme for spouses, journalistic sources and public-interest objections.
• Specify who may receive what material, for which purpose, under which protective conditions.