5 Signs Your Workplace Investigation Won't Hold Up

You have an investigation report in hand. It documents misconduct. You're about to fire someone based on it. Then you pause — what if this ends up in tribunal? Will the investigation survive scrutiny?

Many don't. Not because the findings are wrong, but because the process was flawed. Ontario tribunals (Human Rights Tribunal of Ontario, labour arbitrators, small claims courts) don't ask "what did you find?" — they ask "how fairly was the investigation conducted?"

For a comprehensive overview of investigation types and requirements, see our Complete Guide to Workplace Investigations in Ontario.

A procedurally flawed investigation doesn't protect you. It incriminates you.

Here are the five signs your investigation is at legal risk, and what you need to fix before taking action.

Sign 1: The Investigator Had a Conflict of Interest

The Problem: Your direct manager investigates a complaint against their own team member. Or the investigator has a personal relationship with either party. Or the investigator has a history of problems with the respondent.

Why It Fails: Ontario adjudicators treat an investigation conducted by someone with a conflict of interest as fundamentally compromised. It doesn't matter that the findings are accurate — the process itself is tainted.

In Tribunal: Respondent's lawyer argues: "The investigator was the complainant's manager. Of course they found misconduct. This isn't an investigation; it's a performance management disguised as an investigation."

Illustrative example — composite, not a cited decision: An employer investigated a harassment complaint using the department head who had previously clashed with the respondent. The HRTO found the investigation process itself was tainted by bias. The disciplinary decision was overturned, and the employee was awarded damages.

The Fix:

• Use an external investigator with no prior connection to either party
• If internal investigation is necessary, use HR or someone from a different department with no history with either party
• Document that you considered conflict of interest before assigning the investigator
• In the engagement letter, explicitly state the investigator's independence
• For senior leadership or sensitive allegations, consider investigators trained in trauma-informed methodology to improve evidence quality while maintaining fairness

---

Considering external support for an Ontario employer-side matter? Review our workplace investigation fit and acceptance process. It explains the screening and delivery boundaries; it does not determine legal obligations or predict cost for a specific matter.

---

Sign 2: Proper Notice and Due Process Weren't Given

The Problem: The respondent wasn't told what they're being investigated for. Or they weren't told who made the complaint. Or they weren't given an opportunity to respond to specific allegations before findings were finalized.

Why It Fails: Natural justice — a fundamental legal principle in Ontario — requires that anyone facing consequences must know what they're accused of and have a fair opportunity to respond. This applies to workplace investigations even without unionization or legal representation.

In Tribunal: Respondent's lawyer argues: "My client didn't even know what they were being accused of until the discipline was imposed. They couldn't respond because they didn't know what allegations to address. That's not an investigation; it's a setup."

Illustrative example — composite, not a cited decision: An employer conducted a harassment investigation, interview the respondent vaguely about "workplace conduct," then sent disciplinary findings citing specific statements (quotes the respondent wasn't asked about). The respondent challenged the discipline. The arbitrator found the investigation process violated natural justice principles. Discipline was reduced substantially.

The Fix:

• Provide the respondent with a written summary of the complaint (specific allegations, not vague language)
• Conduct a full interview with the respondent where you address each allegation directly
• Ask the respondent to respond to specific statements or actions attributed to them
• Document that you provided opportunity to respond
• Give the respondent a final opportunity to address draft findings before the report is finalized

Sign 3: Credibility Wasn't Assessed Systematically

The Problem: You believe the complainant and disbelieve the respondent without articulating why. Or you use inconsistent credibility standards — accepting vague claims from one party while demanding detailed proof from the other. Or the investigator doesn't address contradictions in evidence.

Why It Fails: Findings on the balance of probabilities (the standard in Ontario) require systematic credibility assessment. You must articulate why one person's account is more credible than another's. "I believed her" is not a legal finding.

In Tribunal: Respondent's lawyer argues: "The investigator never explained why the complainant's story was more credible. They didn't assess consistency, detail, corroboration, motivation to fabricate. They just preferred one person."

Illustrative example — composite, not a cited decision: An investigation found harassment based on the complainant's account vs. the respondent's denial. The report simply stated "we find the complainant more credible." A tribunal overturned the findings, noting the investigator never addressed: corroboration (any witnesses to the specific incidents?), consistency (was the story consistent across interviews?), detail (did the complainant provide specific dates, times, locations?), or potential bias (did the complainant have motivation to exaggerate?). For guidance on structuring a sound investigation from the start, see our Workplace Investigation Process Guide for Ontario.

The Fix:

• Document credibility assessment for key witnesses/parties
• Address consistency: Is the account consistent across multiple accounts/interviews?
• Address detail: Specific dates, times, locations, what was said — or vague recollection?
• Address corroboration: Do other witnesses support this account?
• Address motive: Does anyone have reason to fabricate or exaggerate?
• Address demeanor: (minor factor, but note it) Was the person confident, evasive, emotional in a way consistent with their claims?
• Use the same standard for all parties (don't demand proof from one and accept stories from another)

Sign 4: Evidence Wasn't Preserved or Properly Documented

The Problem: Key emails disappeared after the complaint was made. Investigators didn't create interview summaries — just rough notes. Documents weren't collected systematically. The chain of evidence is unclear.

Why It Fails: If evidence disappears after a complaint is filed, it suggests intentional destruction. Vague documentation makes findings impossible to verify or defend. A tribunal reviewing the investigation will ask: "Can you prove this finding?" If your documentation is poor, the answer is no.

In Tribunal: Respondent's lawyer argues: "The investigator references emails that no longer exist. The interview summaries are handwritten notes that don't reflect what was actually said. How can we verify any of this? The investigation is based on unverifiable claims."

Illustrative example — composite, not a cited decision: An employer investigated allegations of inappropriate comments. The investigator referenced "multiple Slack messages" but hadn't preserved the Slack records. When asked to produce the messages in tribunal proceedings, they couldn't. The tribunal found the investigation unreliable and overturned the discipline. Learn the complete Workplace Investigation Process to ensure proper evidence handling from the outset.

The Fix:

• Before interviews start, instruct relevant parties in writing to preserve all communications (emails, Slack, Teams, texts, calendars) — and ask your counsel whether a formal litigation hold is required
• Document the preservation instruction in writing to all parties
• Collect evidence systematically (all relevant emails from date range X to Y)
• Create interview summaries within 24 hours of each interview
• Interview summaries should be detailed enough to be verifiable
• Maintain a list of all evidence reviewed and its location
• If evidence is missing or inaccessible, document why
• Avoid relying on memory; use contemporaneous notes

Sign 5: Findings Aren't Clear or Recommendations Aren't Proportional

The Problem: The investigation report is vague about what actually happened. "We have concerns about how interactions were handled" instead of "we find the respondent made three specific statements (quotes provided) that constitute harassment." Or findings are clear but recommended discipline is disproportionate (minor policy violation → termination).

Why It Fails: Vague findings are indefensible. You can't explain your reasoning. Disproportionate discipline is evidence of bad faith or animus. If the findings don't match the recommended action, a tribunal will question both.

In Tribunal: Respondent's lawyer argues: "The report says the investigator has 'concerns' about interactions but doesn't actually specify what misconduct occurred. The discipline is termination. How is that proportional to unspecified 'concerns'? This looks retaliatory, not disciplinary."

Illustrative example — composite, not a cited decision: An investigation found an employee made "inappropriate comments that could be perceived as offensive." Based on this, the employee was terminated. The tribunal found: (1) the findings were too vague to support termination; (2) a minor comment, even if inappropriate, didn't warrant dismissal; (3) the disproportionate response suggested the termination was driven by something other than the investigation findings (possibly retaliation or pretextual). For guidance on what comes after the investigation concludes, see What Happens After a Workplace Investigation.

The Fix:

• State factual findings clearly: "We find that [Name] said [specific quote] on [date] to [witness], and this constitutes [type of misconduct]."
• Support each finding with evidence: interview summaries, documents, witness corroboration
• Distinguish between what you found substantiated vs. what you couldn't verify
• Match discipline to findings: minor violation → counseling/written warning; serious misconduct → suspension/termination
• Document your reasoning for the recommended discipline
• Compare to precedent: have you disciplined similar conduct similarly?

How to Audit Your Own Investigation Before Acting

Before you rely on an investigation to make a disciplinary decision, run this checklist:

1. Conflict Check: Did the investigator have any conflict of interest? Is this documented?
2. Notice and Process: Was the respondent given notice of allegations and opportunity to respond?
3. Credibility: Is credibility assessment articulated for key findings?
4. Evidence: Is all evidence preserved, documented, and verifiable?
5. Findings: Are findings specific and supported by evidence?
6. Discipline: Is recommended discipline proportional to findings?

If you can't answer "yes" to all six, the investigation has legal vulnerabilities.

The Cost of a Flawed Investigation

You think an internal investigation saves money. But if it's flawed:

• You defend the discipline at a tribunal, with counsel fees accruing before any award
• You lose because the process was unfair
• You pay damages, severance, and often a share of the employee's legal costs
• You damage your credibility with future investigations (employee trust is gone)

A proper workplace investigation is quoted after intake, based on the number of parties, evidence volume, urgency, jurisdiction, and reporting scope — a written fee and scope before work begins. A flawed one is priced by a tribunal after the fact.

The Bottom Line

Investigations fail in tribunal because of procedure, not findings. You can find misconduct correctly but conduct the investigation unfairly and still lose.

Before you take disciplinary action based on an investigation, make sure the file is documented so an independent reviewer can follow the evidence to the findings. If it isn't, either fix it or use it as internal information only — don't rely on it for formal discipline.

Not sure whether the file is documented well enough to rely on? Have it reviewed by someone independent. It's far cheaper to fix procedural problems now than to defend them later.

This article is general information, not legal advice — procedural standards turn on the facts, so involve employment counsel on live matters.