How to Prepare for a Workplace Investigation: A Step-by-Step Guide

Preparing for a workplace investigation requires a written plan, clearly defined scope, preserved evidence, and procedural fairness for all parties, before a single interview begins. Canadian employers who follow a structured process reduce their exposure to arbitral challenge and demonstrate the good-faith conduct that courts and tribunals expect when assessing investigation outcomes.

What Is a Workplace Investigation and When Is One Required?

Canadian employment law has evolved significantly since the 1990s, shifting from treating workplace misconduct as a purely internal management matter to recognising a formal legal obligation to investigate. Today, courts, arbitrators, and human rights tribunals across Canada routinely assess not only what an employer decided, but how rigorously they investigated before deciding.

Defining a Workplace Investigation Under Canadian Employment Law

A workplace investigation is a structured, impartial, and documented fact-finding process initiated in response to a specific complaint, incident, or observed conduct. It is fundamentally distinct from performance management or progressive discipline: those processes address ongoing behaviour or capability, while an investigation establishes what happened. A trained investigator applies a consistent process to gather evidence, assess credibility, and make findings expressed on the balance of probabilities standard, the civil standard applied across Canadian employment adjudication.

What Triggers the Obligation to Investigate?

Canadian employers cannot lawfully ignore a formal complaint. Triggering events that create an obligation to investigate include:

• A written or verbal harassment in the workplace complaint from an employee
• A report of workplace violence or a physical threat
• A discrimination allegation under a human rights code
• A health and safety concern that cannot be resolved informally
• A whistleblower report of unlawful conduct or policy breach

The duty to investigate is treated as an implied term of the employment relationship under Canadian labour employment law, and some provincial frameworks specify response timelines, a benchmark of within 7 days for initial acknowledgment appears in several occupational health and safety guidelines.

How Does an Investigation Differ From an Informal Resolution Process?

Informal resolution, which may involve mediation, peer conversation, facilitated dialogue, or managerial coaching, is appropriate for low-level interpersonal friction where both parties consent and the alleged conduct does not constitute a statutory violation. A formal investigation, by contrast, is documented, findings-based, and produces a written report that can be relied upon to justify employer action.

The critical distinction is legal adequacy. Where allegations involve harassment and violence prevention, physical violence, discrimination, or potential criminal conduct, informal routes are rarely sufficient. Proceeding informally in those circumstances exposes the employer to findings of bad faith and can undermine subsequent disciplinary decisions. The seriousness of the allegation, not the preference of the parties, should drive the choice.

Which Canadian Legislation Governs Workplace Investigations?

Key statutes applicable across Canada include:

• Canada Labour Code, Part II (federal jurisdiction, as amended by Bill C-65)
• Canadian Human Rights Act (federal)
• Provincial occupational health and safety acts, including Ontario's Occupational Health and Safety Act and British Columbia's Workers Compensation Act
• Provincial and territorial human rights codes (all 13 jurisdictions)

Federally regulated employers face distinct obligations under Bill C-65, in force since January 2021, which introduced the Work Place Harassment and Violence Prevention Regulations. Provincially regulated employers should consult the applicable provincial law and human rights legislation for jurisdiction-specific thresholds. For broader workplace investigation guidance, see the City Attorneys' Library resource on investigation frameworks.

Building Your Investigation Plan Before Anything Else

The single most common error employers make is treating a workplace investigation as something that will organise itself once interviews begin. It will not. Experienced arbitrators and courts have set aside investigation findings, regardless of their substantive accuracy, because the process lacked a coherent plan from the outset.

Why Is a Written Investigation Plan Essential Before You Begin?

A written plan is the foundation of procedural fairness. It creates an auditable record demonstrating that the employer approached the matter impartially and methodically before any witness said a word. Arbitrators examining investigation outcomes routinely review process documents, including the investigation plan itself, when assessing whether findings are procedurally defensible. The plan should be dated, version-controlled, and retained as part of the investigation file. For further resources on workplace dispute processes, the Dispute Winners blog addresses a range of procedural issues relevant to Canadian employers. A useful starting point for structuring your approach is this pre-investigation checklist from the Employers Council.

Defining the Scope: What Allegations, Which Parties, What Time Period

Scope definition is one of the most consequential decisions made before an investigation begins. The written plan must specify, with precision, the allegations that are in scope, the named parties, complainant, responding party, and any potential witnesses, and the defined date range of the conduct under review. A form capturing this information should be completed and approved before any interviews are scheduled.

Scope creep, the gradual, often unplanned expansion of an investigation into adjacent allegations or new parties, is among the most common procedural vulnerabilities. Once scope changes, every subsequent step must be re-evaluated. Any amendment to the original scope requires documented justification, a revised plan, and re-notification of affected parties. Courts and arbitrators have cited undocumented scope expansion as grounds for challenging both the investigation process and the resulting disciplinary decisions.

Selecting an Impartial Investigator, Internal Versus External

The external investigator option is not simply a premium service; in many circumstances it is the legally prudent choice. Any investigator with a reporting relationship to either party, or any prior involvement in the events under review, is presumptively compromised. For allegations involving senior leadership, the HR function itself, or conduct that may attract media or regulatory attention, an external investigator from a qualified law firm or independent consultancy provides a neutrality that internal appointment cannot replicate. Typical external investigator rates in Canada range from approximately $150 to $350 per hour depending on credentials and market.

Internal vs. External Investigator, Key Considerations

Factor	Internal Investigator	External Investigator
Cost	Lower direct cost	$150–$350/hour (approx.)
Perceived neutrality	Risk of perceived bias	Stronger independence signal
Subject-matter expertise	Varies; may lack HR or legal depth	Typically specialist-trained
Speed of mobilisation	Usually faster to deploy	May require scheduling lead time
Suitability for sensitive allegations	Lower, conflicts more likely	Higher, strongly advisable for senior-level or serious matters

Assessing Whether Interim Protective Measures Are Needed

Before interviews begin, the employer must assess whether protective measures are required to prevent ongoing harm or evidence interference. Options include:

• Administrative leave with pay pending investigation
• Temporary reassignment to a different team or location
• Altered reporting lines to remove the responding party from the complainant's chain of command
• Written no-contact directives served on all relevant parties

These measures are not disciplinary action and must be framed explicitly as non-punitive and proportionate, they reflect precaution, not a finding of fault. Failure to implement interim protective measures where an ongoing risk exists can itself constitute a health and safety violation under provincial occupational legislation.

Setting a Realistic Timeline to Ensure Timeliness

Time is a legal variable in workplace investigations, not merely a project management concern. Several provincial occupational health and safety frameworks treat timeliness as a substantive requirement, and a 90-day outer boundary is commonly referenced in administrative guidance from British Columbia and Ontario. Under the federal Work Place Harassment and Violence Prevention Regulations, the target is even tighter, 45 days. Investigation timelines should be built to account for witness availability, document volume, scheduling of legal review periods, and any union involvement. Delays beyond established benchmarks are routinely cited by complainants and their counsel as evidence of organisational indifference or bad faith, a finding that can independently attract damages in human rights proceedings. Typical investigations range from 30 to 90 days depending on complexity.

Preparing for a Workplace Investigation, Roles, Rights, and Preliminary Steps

What does a complainant actually need to know before their first interview? What is owed to the responding party before allegations are put to them? Most procedural fairness failures in workplace investigations trace back not to the interviews themselves, but to what happened, or failed to happen, in the days before those interviews were scheduled.

What Should the Complainant Be Told Before the Investigation Starts?

Every employee who has filed a complaint deserves written pre-investigation disclosure. That disclosure should address, at minimum:

• The purpose and scope of the investigation, including what allegations are being examined
• The expected process, approximate timeline, and who will serve as investigator
• Confidentiality obligations and their limits, including what information may need to be shared with the responding party
• The right to have a support person present during interviews, where organisational policy permits
• The employer's express prohibition on retaliation and the mechanism for reporting it

Providing this information in writing creates a documented record that the complainant was treated with procedural seriousness from the outset, a detail arbitrators note in their assessments.

Notifying the Responding Party: Disclosure Obligations and Fairness Requirements

The employer's duty of procedural fairness extends with equal force to the responding party. Before being interviewed, the responding party must receive written notice of the general nature of the allegations against them. Depending on the circumstances, particularly where anonymity of the complainant has been requested, the complainant's identity may not be disclosed immediately, but the substance of the allegations must be communicated with enough specificity that the responding party can meaningfully prepare a response.

The foundational Canadian administrative law authority on procedural fairness, Baker v. Canada (Minister of Citizenship and Immigration), articulates the principle that a person facing adverse findings is entitled to know the case against them. Failure to provide adequate pre-interview disclosure to the responding party is among the most frequently cited procedural defects in arbitral awards overturning employer-imposed discipline. This notice, like all pre-investigation communication, must be documented in writing and retained.

Identifying and Preserving Documentary Evidence Early

Evidence spoliation, the loss, deletion, or alteration of relevant records, can be catastrophic to an investigation's integrity. Employers have an obligation to preserve evidence upon reasonable anticipation of a claim, and document preservation must begin within 24 to 48 hours of receiving a complaint. IT systems may require a litigation hold to prevent automated deletion of emails or access logs. Guidance on document review and investigation planning from Ogletree provides practical detail on this step.

Documentary Evidence Preservation Checklist

• Relevant emails, instant messages, and electronic communications
• HRIS records (attendance, performance records, prior disciplinary history)
• Building or system access logs covering the relevant time period
• Surveillance footage, where applicable and legally permissible
• Prior complaint history involving any of the named parties
• Copies of workplace policies in effect at the time of the alleged conduct

Establishing Confidentiality Protocols for All Parties Involved

Confidentiality in workplace investigations is not an absolute obligation, it must be calibrated against competing legal requirements, including the responding party's right to know the allegations and the organisation's duty to share findings with decision-makers who must act on them. Witnesses should be asked, not ordered, to maintain confidentiality during the investigation. Several provincial labour relations boards have found that mandatory gag orders imposed on employees as a condition of participation may violate labour relations statutes.

Confidentiality instructions issued to each party should be documented in writing and should specify: what information they are asked to protect, to whom they may disclose for the purpose of obtaining legal or union advice, and for how long the obligation applies. Training managers and HR staff on the boundaries of investigation confidentiality is an often-overlooked step that prevents inadvertent disclosure and protects the employer's position. To understand our team's approach to confidentiality in workplace disputes, visit Dispute Winners.

Privacy obligations also apply: PIPEDA and its provincial equivalents govern how personal information collected during an investigation is stored, accessed, and disclosed. These obligations survive the investigation's conclusion in most jurisdictions.

How to Conduct Interviews During a Workplace Investigation

Research into wrongful dismissal and human rights adjudication consistently shows that investigative credibility findings, made or broken during interviews, are cited in more than 60% of arbitral decisions that overturn employer discipline. How an investigator frames questions, sequences parties, and documents responses is not a soft skill; it is a legal liability management function.

Drafting Effective Interview Questions for Each Witness Category

Well-constructed interview questions are the investigator's primary fact-gathering instrument. Initial questioning should rely heavily on open-ended questions, "Tell me what happened on that occasion", which allow the witness to provide an unfiltered narrative before the investigator begins testing specific details. Closed or clarifying questions are introduced in the second phase to address gaps, inconsistencies, or factual disputes. Leading questions should be avoided in the initial round because they signal the investigator's expectations and compromise the independence of the response.

Question sets should be tailored to each witness category: the complainant's questions will focus on establishing the full narrative; the responding party's questions will address each specific allegation; eyewitnesses will be asked about observed conduct; and character witnesses, if permitted, will be directed to specific relevant behaviours. All question sets should be prepared in advance, documented, and retained. Follow-up probing questions are not only appropriate, they are expected of a competent investigator.

In What Order Should You Interview the Complainant, Responding Party, and Witnesses?

Interview sequencing directly affects the integrity of the evidence gathered. The following sequence reflects both best practice and the procedural requirements recognised in Canadian arbitral jurisprudence.

Recommended Interview Sequence

1. Complainant first, Establish the full allegations, the timeline, and the complainant's account before any other party is interviewed. This ensures the investigator understands precisely what is in dispute.
2. Independent witnesses second, Interview witnesses who observed relevant conduct or have direct knowledge of events before the responding party is interviewed, to reduce the risk of the responding party tailoring their account after learning what witnesses have said.
3. Responding party third, With the allegations and witness accounts already documented, the investigator can put specific adverse evidence to the responding party and provide a genuine opportunity to respond to each point.
4. Follow-up interviews as required, If significant new evidence emerges after the responding party's interview, a second round with the complainant employee or relevant witnesses may be necessary before findings are drawn.

Best Practices for Creating a Reliable Interview Record

Contemporaneous, accurate note-taking is as important as the questions asked. Where feasible, a second note-taker should be present so the lead investigator can maintain eye contact and observe non-verbal cues while the record is created. Audio recording is an option in some circumstances, but consent requirements vary by province, Ontario and British Columbia both require all-party consent for recordings, and non-compliance can render a recording inadmissible and expose the employer to privacy liability.

Following each interview, the investigator should produce a written summary within 48 hours while recollection remains sharp. That summary should be provided to the interviewee for review and correction. Notes should include verbatim quotes where possible, be dated, and be signed by the investigator. Full interview records must be retained as part of the investigation file for a minimum of 3 years in most Canadian jurisdictions. For detailed guidance, see interview preparation and documentation best practices from HR Acuity.

How Should You Handle a Witness Who Refuses to Co-operate?

Non-cooperation is a practical reality investigators occasionally face, and the appropriate action is both firm and documented. Employees have a general duty to cooperate with employer-initiated investigations as a component of their employment obligations; outright refusal without reasonable justification may constitute insubordination and expose the employee to discipline. Union members should be reminded that the obligation to cooperate coexists with their right to union representation, they are entitled to representation, not to silence. The investigator should document all refusals in writing, note the date, the reason given (if any), and any follow-up taken. The investigation may proceed to findings on the available evidence, and the refusal itself may be noted as a relevant factor in the credibility assessment.

Applying Procedural Fairness When Presenting Adverse Evidence to the Responding Party

The "case to meet" obligation is one of the most important, and most frequently violated, requirements in Canadian workplace investigations. Before findings are drawn, the responding party must receive a fair and complete summary of the adverse evidence and a genuine opportunity to respond to each significant piece of it. This obligation draws from the principle articulated in Renaud v. Central Okanagan School District at the Supreme Court of Canada and has been adopted widely in Canadian labour arbitration.

This disclosure step is separate from the initial interview. If significant new evidence emerges after the responding party has already been interviewed, a follow-up disclosure and response opportunity is mandatory before the report is finalised. The process of presenting adverse evidence should itself be documented, the investigator should record what was disclosed, when, and what response was provided. Failure to follow this step has led arbitrators to quash investigation findings and reinstate disciplined employees regardless of the substantive merits.

Handling Harassment and Violence Allegations, Specific Considerations in Canada

When a federally regulated employer received a formal harassment and violence prevention report in 2021 under the newly proclaimed Work Place Harassment and Violence Prevention Regulations, their HR team discovered that their existing investigation procedure, developed before Bill C-65, was non-compliant in 4 distinct areas. The cost of redesigning their process mid-investigation far exceeded what a compliant procedure would have required upfront.

Federal Requirements Under Bill C-65 and the Canada Labour Code

For federally regulated employers, banks, telecommunications carriers, interprovincial transport companies, and Crown corporations, workplace harassment and violence obligations are governed by the Work Place Harassment and Violence Prevention Regulations (SOR/2020-130), which came into force on November 1, 2021 under the law of the Canada Labour Code, Part II. These Regulations require that a Notice of Occurrence be filed as the first formal step when a harassment or violence incident is reported.

Federally regulated employers must also complete a joint workplace assessment, a structured review of risk factors conducted with a designated recipient, before an investigation is formally initiated. Under the Regulations, the investigation must be completed within 45 days, unless both parties agree to an extension. This timeline is substantially shorter than the 90-day benchmark commonly referenced in provincial guidance, and employers in federal jurisdiction who allow matters to drift beyond this window face regulatory exposure. The key steps under the federal framework differ meaningfully from provincial processes, and employers should not assume that a provincial investigation template will satisfy federal requirements.

Provincial Obligations for Harassment and Violence Investigations

All 13 Canadian provinces and territories have occupational health and safety or human rights legislation that addresses workplace harassment and violence to varying degrees. Ontario was among the first provinces to explicitly address the issue: Bill 168, which amended the Occupational Health and Safety Act in 2010, introduced mandatory written policies, risk assessments, and investigation requirements for violence or harassment incidents.

British Columbia's Workers Compensation Act and associated regulations impose comparable obligations on provincially regulated employers in that jurisdiction. Each province and territory has developed its own procedural expectations, and a violence and prevention guide specific to the applicable jurisdiction is an essential reference before conducting the investigation into harassment or violence allegations. For guidance on evidence preservation steps in these contexts, the Employers Council workplace investigations resource provides a useful overview.

Employers operating across multiple provinces should maintain jurisdiction-specific annexes to their investigation policy, rather than attempting to apply a single national template. The risk of non-compliance is greatest at the intersection of federal and provincial obligations, for example, where a federally regulated employer has employees working in a province with additional statutory requirements.

The Role of the Workplace Assessment and Investigation Notice Under the Federal Regulations

The employer incident reporting process under the federal Regulations involves a defined sequence that differs substantially from the informal intake processes many employers used before Bill C-65. The Notice of Occurrence must identify the parties, describe the nature of the occurrence, and indicate whether the parties wish to attempt negotiated resolution before an investigation is initiated. This negotiated resolution pathway reflects an explicit legislative preference for early resolution, but it is not available for all categories of conduct, and employers must assess eligibility carefully before diverting a matter to that stream. An incident investigation under the federal framework must be conducted by a qualified investigator who meets the competency requirements described in the Regulations, and the resulting report must conform to a prescribed format.

Documenting the Investigation Under Harassment-Specific Frameworks

Conducting the investigation of a harassment or violence allegation requires documentation standards that exceed those for a general workplace investigation. All communications with the parties, all evidence gathered, and all procedural steps taken must be retained in a secure investigation file. Under both federal and provincial frameworks, the employer must provide a written summary of findings to both the complainant and the responding party. The concept of practical law as applied in this context means that documentation is not a bureaucratic formality, it is the mechanism by which the employer demonstrates compliance to a regulator, arbitrator, or human rights tribunal if the matter is subsequently challenged. Conduct interviews with particular care in harassment matters: the investigator must apply a trauma-informed approach, avoid secondary victimisation, and remain alert to the power dynamics that often characterise these cases.

Internal Policy Compliance as a Foundation for Harassment Investigations

An internal workplace harassment and violence prevention policy that pre-dates the investigation is a critical asset. If the policy was inadequate, out of date, or not communicated to employees before the alleged conduct occurred, the employer's investigation findings, even if procedurally sound, may be undermined by the absence of clear standards. Workplace harassment and violence policies should be reviewed and updated at minimum annually, and employees should acknowledge receipt in writing. The terms of reference for any harassment investigation should cross-reference the applicable policy, the relevant statute, and the Regulations to establish the normative framework within which the investigator is operating. For a broader discussion of how these obligations intersect with Canadian dispute resolution practice, the resources on Dispute Winners provide practical perspective for HR professionals and legal counsel alike.

Key Takeaways

• Begin with a written plan. Define scope, parties, timeline, and investigator selection before any interviews are scheduled. Arbitrators assess process documents, an undated or undocumented plan is a procedural liability.
• Preserve evidence within 48 hours. Issue litigation holds, secure electronic records, and document the preservation steps taken. Evidence lost before the investigation begins cannot be recovered.
• Provide written disclosure to both parties. The complainant and the responding party each have procedural rights before their first interview. Failure to disclose the nature of allegations to the responding party is the single most frequently cited procedural defect in Canadian arbitral awards.
• Follow the recommended interview sequence. Complainant first, independent witnesses second, responding party last, this sequencing protects the integrity of evidence and satisfies the "case to meet" obligation.
• Apply jurisdiction-specific standards for harassment and violence. Federal employers under Bill C-65 face a 45-day investigation completion target and a mandatory Notice of Occurrence process. Provincial frameworks vary. A single national template is rarely sufficient across all operating jurisdictions.

FAQ

What is the legal standard of proof in a Canadian workplace investigation?

Canadian workplace investigations apply the balance of probabilities standard, the same civil standard used in courts and human rights tribunals. This means the investigator must determine whether it is more likely than not that the alleged conduct occurred. The criminal standard of proof beyond a reasonable doubt does not apply. Findings are not convictions; they are factual conclusions that inform employer decision-making.

Can an employer conduct a workplace investigation without a lawyer or external investigator?

Yes, internal investigations are legally permissible and common. However, for allegations involving:

• Senior leadership or the HR function itself
• Sexual harassment or violence
• Conduct that may result in termination for cause
• Matters with significant regulatory exposure

an external investigator, whether from a law firm or independent consultancy, is strongly advisable. Internal investigators must be demonstrably impartial, trained, and free of any conflict of interest.

How long does a workplace investigation typically take in Canada?

Duration depends on complexity, the number of witnesses, and the volume of documentary evidence. Most investigations range from 30 to 90 days. Under the federal Work Place Harassment and Violence Prevention Regulations, the target completion period is 45 days. Provincial frameworks do not always specify a deadline, but prolonged delays, without documented justification, can be treated as evidence of bad faith by adjudicators.

What happens if the responding party refuses to participate in the investigation?

Employees generally have an implied obligation to cooperate with legitimate employer investigations. Refusal without reasonable justification may constitute insubordination and expose the employee to discipline. The investigator should:

1. Document the refusal in writing, including date and reason given.
2. Advise the employee of their obligation and the consequences of non-participation.
3. Proceed to findings on the available evidence if the refusal continues.

Union members retain the right to representation but not the right to silence.

Does every workplace complaint require a formal investigation?

No. Low-level interpersonal conflicts, minor policy disagreements, or conduct that both parties agree to resolve informally may be addressed through mediation, coaching, or facilitated dialogue without triggering a formal investigation process. However, once an allegation involves harassment in the workplace, discrimination, violence, or potential statutory violation, informal resolution is rarely legally adequate and the employer's duty to investigate is engaged. The nature and seriousness of the allegation, not the preference of the parties, determines the appropriate process.

What records must be kept after a workplace investigation concludes?

Employers should retain the complete investigation file, including the written plan, all interview notes and summaries, documentary evidence, correspondence with parties, and the final report, for a minimum of 3 years in most Canadian jurisdictions, and longer where the matter may give rise to subsequent litigation or regulatory proceedings. Records must be stored securely in compliance with PIPEDA or applicable provincial privacy legislation, and access should be limited to those with a demonstrated need to know.