Criminal evidence: relevance, admissibility and use at trial

Overview

A criminal file may contain interviews, recordings, objects, photographs and reports. Disclosure gives the defence access to material for preparing the case. It does not turn every item in that file into trial evidence. The party seeking to use an item must identify the issue it addresses and satisfy the rules governing its reception. Once received, the item must still be assessed with the rest of the record.

This lesson concerns ordinary Canadian criminal trials, including those held in Quebec. Federal legislation, the Canadian Charter of Rights and Freedoms and common-law evidence rules govern this analysis. Different procedural stages can use different evidentiary rules. An item considered at a release hearing does not become admissible at trial merely because a judicial officer has already seen it. Provincial penal proceedings also require attention to their own governing legislation.

The useful starting point is a sequence of decisions: identify the factual proposition, identify the proposed evidentiary use, apply the admission rules, and assess the resulting proof. Keeping these decisions separate prevents a strong suspicion from becoming a substitute for admissible evidence or an admitted exhibit from becoming a substitute for proof of guilt.

Learning Objectives

• Distinguish relevance, admissibility and the final assessment of evidence.
• Explain why the proposed purpose and applicable exclusionary rule determine the admission analysis.
• Prepare and respond to an evidentiary objection without confusing a preliminary ruling with the verdict.

Start with a fact and a proposed use

Connect the item to the issues

Relevance (pertinence) depends on the live issues in the particular proceeding. A witness's observation that a delivery van entered a yard at midnight may help establish opportunity. Its significance depends on whether the Crown alleges that the offence occurred there at that time, whether vehicle identity is disputed, and what other evidence connects the vehicle to the accused. An observation does not become irrelevant simply because it leaves several inferential steps unresolved.

In R. v. Schneider, 2022 SCC 34, paras. 36–41, the Supreme Court describes a low threshold: the evidence must tend to increase or decrease the probability of a fact in issue. It need not establish that fact by itself. Context matters, including other evidence already introduced or that a party undertakes to introduce. Where the necessary connection depends on later proof, the judge may admit the item conditionally. If the promised connection fails, its continued use must be addressed.

The proposed chain of reasoning should be stated expressly. A receipt may support a purchase at a particular place; other evidence may be needed to identify the purchaser and connect the time of purchase to the charge. Counsel should distinguish those propositions instead of describing the receipt as simply incriminating. The defence can challenge an inferential link without having to explain every feature of the prosecution file.

Specify the evidentiary purpose

The same words can have different legal uses. A warning may be offered to prove that its recipient was put on notice, or to prove that the danger described actually existed. The second use relies on the truth of the statement; the first may depend only on its communication. Calling evidence background does not settle this distinction. The receiving person's knowledge or response must itself matter to a live issue.

This purpose determines which rules apply. An out-of-court statement offered for its truth raises hearsay concerns. A previous inconsistent statement used to challenge a witness does not automatically become proof that its earlier contents were true. A document's authenticity does not answer either question. The hearsay lesson develops the separate admission routes for statements.

When several uses are proposed, each needs analysis. A limiting instruction can explain the permitted use and prohibit an improper inference. Its adequacy depends on the evidence and the risk. The possibility of giving an instruction does not guarantee admission where the applicable rule requires exclusion. Nor should the final argument silently expand a use that the judge restricted during the hearing.

Apply the admission rules before assessing guilt

Relevance opens the inquiry

Admissibility (admissibilité) requires more than a logical connection. Schneider identifies three components: relevance, applicable exclusionary rules, and the judge's discretion to exclude. These components provide an organizing method; particular evidence may involve several overlapping requirements. A relevant statement can still be hearsay. A relevant communication may be privileged. A relevant recording may raise constitutional questions about how the state obtained it.

Classifying the issue accurately avoids applying a convenient but incorrect test. The voluntariness of a statement to a person in authority differs from the authenticity of a recording. The conditions for expert opinion differ from the conditions for receiving an ordinary observation. Sexual-history and protected-record evidence can require a specific statutory application. A general assertion that the evidence is helpful cannot replace these requirements.

The allocation and standard of proof also depend on the rule. There is no universal formula that every admission dispute is decided beyond a reasonable doubt. Nor does the Crown's ultimate burden mean that every preliminary factual issue uses the same standard. For example, under the confessions rule, the Crown must establish voluntariness beyond a reasonable doubt when tendering the accused's statement to a person in authority. An accused alleging a Charter breach generally bears the burden of establishing that breach on a balance of probabilities. R. v. Oickle, 2000 SCC 38, para. 30, distinguishes those inquiries. Before the hearing, identify the preliminary facts and the governing burden, including any applicable exception.

The statements lesson and Charter remedies lesson explain those distinct routes. The witnesses lesson addresses the additional screening of expert opinion; the character and sexual-history lesson explains specialized restrictions that general balancing cannot replace.

Balance value and legally relevant prejudice

Probative value concerns the contribution the evidence can make to resolving an issue. Prejudicial effect concerns a legally improper cost of receiving it. Evidence is not prejudicial in this sense merely because it makes the accused's defence harder. A clear, properly obtained recording can be highly damaging and highly useful. The concern is, for example, that a jury might convict because it dislikes the accused, overvalue emotionally powerful material, or lose the central issues in a disproportionate subsidiary dispute.

The general balance differs depending on who offers the evidence. R. v. Grant, 2015 SCC 9, paras. 18–22, explains that Crown evidence is excluded where its prejudicial effects outweigh its probative value. Defence evidence relevant to a legally available defence receives greater protection: prejudice must substantially outweigh its value before exclusion on this general basis. Specific statutory or common-law rules must still be applied according to their own terms.

The defence standard protects the opportunity to raise a reasonable doubt. It does not authorize irrelevant speculation or erase exclusions protecting other interests. Equally, a judge must not import the Crown's burden for a particular incriminating category into defence evidence merely because both involve similar subject matter. Grant illustrates the danger in the treatment of evidence suggesting an unknown third-party perpetrator.

Balancing should examine the actual proposed presentation. Removing unnecessary graphic images, narrowing the disputed issue, using an agreed fact or giving a suitable instruction may reduce an identified risk. Those possibilities should be considered without treating them as mandatory substitutes in every case. The ruling must remain responsive to the value and risks of the evidence actually offered.

Make the ruling through a fair process

Raise a precise objection

An objection should identify the question, answer or exhibit at issue, its proposed use, and the legal problem. Raise a foreseeable issue before the evidence reaches the jury and check any application or notice requirement. If the issue arises unexpectedly, intervene promptly; if the answer has already been given, ask the judge to address its permitted use or exclusion. An assertion that testimony is unfair gives the judge little basis for deciding whether the concern is hearsay, privilege, speculation or a prohibited inference. Counsel should state enough to make the issue intelligible while avoiding the disclosure of disputed material to a jury before the judge decides whether it may hear it.

The response should supply the missing foundation or explain the applicable admission route. If a witness lacks personal knowledge of a fact, producing the witness's report may not cure the difficulty. If the objection concerns only part of a document, the parties should identify whether redaction or a restricted use can resolve it. The court may need submissions alone, agreed preliminary facts, or additional testimony.

A voir dire ordinarily separates a preliminary evidentiary dispute from the trial's merits. In a jury trial, the jury generally does not hear the contested material while admissibility is being determined. A full separate hearing is not required for every exhibit or objection. Schneider, para. 37, specifically recognizes that the need for a voir dire for party admissions depends on the circumstances. A party must nevertheless receive a fair opportunity to address a material admission question. The absence of an objection does not dispense with a hearing or admission condition that the governing rule requires.

Record the scope of the decision

The record should distinguish material tendered for identification from material received as evidence. It should also identify the purpose for which an exhibit was admitted, any passages excluded, and any conditions on its use. This matters when the parties prepare closing arguments and when a jury receives exhibits for deliberation. Administrative labelling alone cannot answer a legal dispute about the exhibit's permissible use.

In a judge-alone trial, the same person decides admission and the merits, but the functions remain distinct. Material heard for a preliminary ruling does not automatically become proof of guilt. The parties should make clear what evidence is incorporated into the trial record and what remains confined to the preliminary issue. An agreement about using evidence should identify its limits rather than rely on an unexplained assumption that everything carries over.

Judges can control repetitive, misleading or irrelevant questioning and manage the trial's progress. In R. v. Samaniego, 2022 SCC 9, paras. 22–26, the majority emphasizes that trial management cannot shelter an erroneous evidentiary ruling. Efficiency does not authorize excluding otherwise relevant and material evidence simply to shorten proceedings. Counsel likewise cannot convert repetition or an unsupported accusation into a protected evidentiary right by insisting on continuing it.

Distinguish admission from persuasive force

Assess the evidence that was received

Weight (poids) is assessed after the court identifies what evidence can properly be used. A witness may competently describe a brief observation even though distance and poor lighting reduce its persuasive force. A document can be authentic yet mistaken. An admissible expert opinion can rest on an assumption that the trial evidence does not establish. The ultimate assessment must account for these limits.

Credibility and reliability require related but distinct attention. A sincere witness can perceive an event inaccurately or confuse later information with an original memory. A witness who is mistaken about one detail is not necessarily dishonest about everything. The court assesses the account in context, including opportunities to observe, consistency, explanations for discrepancies and support from other evidence. Demeanour alone cannot resolve these factual difficulties.

A preliminary finding of sufficient reliability for an admission rule does not settle ultimate reliability. Threshold screening asks whether the evidence may be considered under the applicable rule; the trier of fact still determines what to accept. Conversely, an apparent weakness cannot always be postponed to weight if it means a required admission condition has never been satisfied.

The final question concerns the Crown's proof of the elements, including the accused's identity where disputed. The prosecution does not win merely because its version seems more likely. The defence does not ordinarily have to prove a competing story. See criminal proof and reasonable doubt for the whole-record analysis and the treatment of evidence capable of raising a doubt. The jury lesson addresses specific cautions for testimony that calls for particular scrutiny and the role of independent confirmation.

Worked example: an alarm warning and an ambiguous clip

Factual Scenario

In this hypothetical trial for break and enter with intent to steal tools, the Crown alleges that Alex forced open a locked equipment room and entered without authority. A building attendant says that, before the entry, she personally told Alex that the room was restricted. A camera clip recorded at the time of the alleged entry shows someone in a common dark coat entering the corridor leading to that room. A witness saw Alex wearing such a coat earlier that evening. The original recording is available and its authenticity is established. Identity and Alex's knowledge that entry was unauthorized remain disputed. Assume no privilege, confession or Charter issue arises from these items.

The Crown offers the attendant's words to establish notice and the clip to support identity. The defence argues that neither proves the whole offence and asks the judge to reject both. Separately, the Crown proposes to use the warning to prove that the attendant actually had authority to restrict the room, although she has not testified about the source of that authority.

Reduce unnecessary proof without obscuring disputes

Agree on facts precisely

A formal admission can remove an unnecessary evidentiary dispute. Criminal Code s. 655 permits the accused or counsel, at a trial for an indictable offence, to admit an alleged fact so that proof is dispensed with. An agreement should identify exactly what is admitted. Agreeing that a laboratory received a sealed package does not necessarily admit the source of its contents, the scientific conclusion or the accused's responsibility.

Such agreements can spare witnesses from attending solely to establish uncontested foundations. They require care because an admission may close off a factual dispute that otherwise remains for proof. The parties should distinguish admitting authenticity, admitting the truth of specified contents, and admitting an ultimate fact. A vague statement that a document is agreed can leave the scope of the concession uncertain.

Judicial notice also dispenses with ordinary proof in appropriate circumstances, but has a different basis. The Canada Evidence Act, ss. 17–18, addresses notice of legislation. For facts about the alleged conduct, the threshold is strict: the fact must be so generally accepted that reasonable people would not dispute it, or immediately verifiable through readily accessible sources whose accuracy is indisputable. A judge's private knowledge does not satisfy that test merely because producing evidence would take time. R. v. Find, 2001 SCC 32, paras. 48–49, explains the test and why disputed expert propositions ordinarily need evidence.

Contextual social or legislative facts require care as well. R. v. Spence, 2005 SCC 71, paras. 58–63, explains that attaching one of those labels does not remove the need for a trustworthy foundation; the closer the fact is to the issue that decides the case, the stronger the need to apply the strict criteria. Any proposed use of judicial notice should identify the precise fact, its legal basis and the opportunity for the parties to address it.

Preserve the sequence of proof

The ordinary trial sequence gives the Crown the opportunity to present its case, followed by any defence evidence, subject to procedural applications and the applicable rules. Cross-examination can supply defence-supporting evidence during the Crown's case. The accused's decision not to call evidence does not transform every uncontradicted allegation into an established fact.

Reply evidence and reopening raise fairness concerns distinct from initial relevance. A party should not assume that it can reserve available proof, see the opponent's response, and then repair its presentation without permission. Under R. v. Krause, [1986] 2 SCR 466, paras. 15–16, the Crown generally must present the evidence on which it relies in its own case. Reply may be permitted to address a new matter raised by the defence that the Crown could not reasonably anticipate and had no opportunity to address. Merely reinforcing an earlier case with available evidence does not justify splitting it.

Reopening a completed stage is a separate request. Its treatment depends on the governing rules, the stage reached and fairness to the accused. The trial lesson develops the hearing sequence. An evidentiary plan should identify necessary witnesses, documents, notices and foundations before the expected close of the party's case.

The practical product is a short issue-based record: the fact to be proved, the proposed source, the admission route, any objection, the ruling and the permissible final use. This record makes omissions visible and keeps closing submissions tied to the evidence the court actually received.

Practice Checklist

• Identify the live fact and each proposed use of the item.
• Separate disclosure, authentication, admissibility and ultimate proof.
• Check the governing exclusionary rule, procedural notice and burden.
• Apply the correct Crown or defence prejudice balance.
• Request a preliminary hearing where the issue requires it.
• Record restrictions, redactions and conditions of admission.
• Assess credibility, reliability and the complete evidentiary picture.
• State precisely what an agreement dispenses with proving.