Ontario employers operate under significant legal obligations when it comes to workplace investigations. Section 32.0.7 of the Occupational Health and Safety Act (OHSA) isn't optional guidance—it's a legal mandate backed by enforcement power. Understanding these obligations, and getting them right, can be the difference between a resolved conflict and a multi-year legal dispute.

This guide explains what Ontario employers must do, when they must do it, and what happens when they don't.

The Legal Framework: What Triggers Your Duty to Investigate

OHSA Section 32.0.7 requires employers to investigate any allegation of workplace violence or harassment. But what counts as an "allegation"?

Allegation is broadly defined. It includes:

Formal complaints — written reports filed through HR or a complaint procedure
Informal reports — verbal concerns raised to a manager, HR staff, or anyone in a position of authority
Third-party reports — someone reporting another person's experience
Observed conduct — a manager witnessing behavior that constitutes harassment or violence
Anonymous reports — even unnamed reports typically trigger the obligation to investigate

This breadth matters. You cannot ignore a hallway comment or delay because someone "isn't sure if they want to file a formal complaint." The moment a potential violation reaches anyone in management or HR, the clock starts.

Ontario Human Rights Code obligations overlap with OHSA Section 32.0.7. The Code prohibits discrimination and harassment on protected grounds (race, gender, disability, age, family status, sexual orientation, etc.). A harassment allegation that involves a protected ground may trigger both OHSA compliance and HRTO (Human Rights Tribunal of Ontario) exposure.

Bill 168 (Occupational Health and Safety Amendment Act, 2009) strengthened these requirements, specifically defining workplace harassment and violence and mandating employer investigation and prevention duties. Non-compliance carries penalties up to $1.5 million for corporations.

What Counts as a "Reasonable Investigation"?

Regulators and arbitrators assess investigations against a "reasonableness" standard. What does that mean?

A reasonable investigation includes:

Timely start — Investigation must begin promptly. "Prompt" typically means within 24-48 hours of receiving an allegation. Delays weaken credibility and allow evidence to disappear.
Scope determination — Before investigating, you must determine the scope: What exactly is alleged? Who is involved? What outcome is being sought? This shapes the investigation plan.
Witness identification and interviews — You must identify and attempt to interview all relevant witnesses, including the complainant, the respondent, and any bystanders or people with knowledge of the conduct.
Document collection — Email, text messages, logs, schedules, policies, prior complaints, and any written documentation relevant to the allegations must be gathered and reviewed.
Interview consistency — Interviews must cover the same key facts for all parties. Different questions for different witnesses reduces confidence in findings.
Neutral investigator — The investigator should have no prior relationship or conflict with the parties. An internal HR person can conduct a reasonable investigation, but independence matters for credibility.
Detailed documentation — Interview notes, evidence, and reasoning must be recorded. "He said, she said" conclusions will not survive arbitration.
Balance of probabilities standard — Findings are based on the civil standard (more likely than not), not criminal proof beyond a shadow of doubt.
Confidentiality — The investigation must be conducted discreetly, with information shared only on a need-to-know basis.
Timely conclusion — The investigation should be completed within 30-60 days unless complexity justifies an extension. Indefinite delays suggest bad faith.

Courts and arbitrators have rejected investigations that:

Skip witness interviews
Focus only on the complainant's account
Lack documented reasoning for conclusions
Stretch for months without clear justification
Involve investigators with conflicts of interest
Fail to collect available evidence

Investigation Timelines: What the Law Expects

Ontario does not specify a rigid timeline in OHSA Section 32.0.7. Instead, regulators expect a "prompt" investigation. Here's what "prompt" means in practice:

Days 1-2: Receive allegation, begin preliminary assessment, identify investigator, notify key parties (complainant, respondent, legal counsel if warranted).

Days 2-7: Conduct initial witness and respondent interviews, collect available documents, assess scope.

Days 7-30: Complete additional interviews, gather any outstanding evidence, review findings, prepare draft conclusions.

Days 30-45: Allow respondent to respond to draft findings or key allegations, refine conclusions, prepare remedial recommendations.

Days 45-60: Deliver final report, implement remedial actions, document outcomes.

Complexity justifies extension: If an investigation involves 20+ witnesses, ongoing litigation, or parallel criminal investigation, you may justify extending to 90 days. Document the rationale.

Delay triggers scrutiny: If an investigation drags beyond 90 days without clear justification, regulators and arbitrators question whether the employer took the obligation seriously.

Documentation Requirements: What You Must Record

Your investigation file must include:

Allegation details — Written record of what was reported, when, by whom, and to whom
Investigation plan — Scope, investigator identity, timeline, parties involved
Interview notes — Dated, signed summaries of each interview (contemporaneous notes are stronger than notes written later)
Exhibits — Email, texts, policy violations, schedules, prior complaints
Witness list — Who was interviewed, who was attempted but unavailable, reasons for any gaps
Analysis and reasoning — How did you assess credibility? What evidence supported or undermined each allegation? Why did you reach your conclusion?
Findings and conclusions — What did you find? Which allegations were substantiated, unsubstantiated, or inconclusive?
Remedial actions — What corrective measures will be taken (discipline, training, monitoring, policy enforcement)?
Closure communication — Written confirmation to complainant and respondent of findings and next steps

Common documentation failures:

Notes written weeks after interviews (credibility problem)
Unsigned or undated entries (authentication problem)
Missing interview notes (appears to have skipped interviews)
No documented reasoning (looks like predetermined conclusion)
Verbal-only findings (no written record, no defensibility)

What You Must Do With Findings: Taking Action

An investigation is not complete when findings are reached. You must act on those findings.

If allegations are substantiated:

Implement corrective action proportionate to the violation (training, discipline, removal, retraining)
Communicate the outcome to the complainant and respondent in writing
Document the corrective action taken
Monitor compliance (is the behavior stopping?)
If ongoing concern, escalate response

If allegations are unsubstantiated:

Communicate clearly to the complainant that findings do not support the allegations
Explain the basis for that conclusion (evidence did not align, accounts were inconsistent, etc.)
Assure the complainant of anti-retaliation protection
Close the file with documented rationale

If allegations are inconclusive:

Be transparent about lack of sufficient evidence
Outline what would be needed to reach a conclusion
Implement interim measures if appropriate (separation of parties, monitoring)
Consider whether further investigation is warranted

Anti-retaliation: You must explicitly protect the complainant from retaliation. Any adverse action against the complainant (demotion, schedule change, isolation) after a complaint can be seen as retaliation, even if not explicitly connected. Document anti-retaliation protections in your investigation file.

The Role of Legal Counsel: When to Involve Your Lawyer

Should your investigation involve legal counsel?

Involve counsel early if:

The allegation involves a protected ground under the Ontario Human Rights Code
A formal HRTO complaint has been filed
The conduct could constitute harassment or violence under Bill 168
Criminal conduct is alleged (violence, theft, etc.)
Senior leadership is involved
The complainant or respondent has indicated intention to pursue legal action

Counsel can help by:

Advising on scope and investigation approach to maintain legal privilege (work product doctrine)
Reviewing your investigation plan for legal exposure
Advising on findings and defensibility
Preparing for potential tribunal or regulatory review

Do not let counsel conduct the investigation itself if you want to maintain privilege. Instead, have counsel oversee or advise an HR investigator. This preserves the work product doctrine—critical for future litigation.

Common Failures and Their Consequences

Failure to investigate at all

Consequence: OHSA violation, MOL Order to Comply, fines up to $1.5 million (corporation), personal liability for officers, HRTO claim
Real example: A manager knew of harassment allegations but did not report to HR or investigate. When the complainant filed an HRTO claim, the lack of any investigation became evidence that the employer didn't take the duty seriously.

Delayed investigation

Consequence: Witness memories fade, evidence disappears, findings become less credible, MOL inspection may be triggered
Real example: An allegation was reported in January, but investigation didn't start until July. By then, emails had been deleted and witnesses had moved on. The investigation was deemed unreasonable.

Incomplete investigation (missing interviews)

Consequence: Arbitrators distrust the findings; HRTO assumes you didn't investigate fairly
Real example: An HR manager interviewed the complainant and one witness but not the respondent. Arbitrator ruled the investigation was procedurally unfair.

Conflict of interest

Consequence: Findings are presumed biased; tribunal orders a new investigation
Real example: The respondent was the investigator's friend. When the respondent was found unsubstantiated, the tribunal rejected the finding as not independent.

Poor documentation

Consequence: You cannot defend your findings or demonstrate you investigated
Real example: A company claimed it investigated, but when pressed at tribunal, could not produce interview notes. The tribunal assumed no real investigation occurred.

Retaliation

Consequence: HRTO claim on top of original claim, aggravated damages, lost case
Real example: The complainant was scheduled for layoff two weeks after filing a harassment complaint. The employer argued the layoff was unrelated, but the timing triggered a retaliation claim worth $50,000+ in damages.

No action after investigation

Consequence: Findings are meaningless if not followed by remedial action
Real example: An investigation substantiated harassment, but the respondent received no discipline. The complainant filed an HRTO claim claiming the employer condoned the behavior.

How 1205 Consulting Helps

Workplace investigations are complex, high-stakes work. A misstep—even an inadvertent one—can expose your organization to regulatory action, tribunal claims, and reputational damage.

1205 Consulting brings a structured, OHSA-compliant approach to investigation:

Investigation planning — We scope the allegation, identify witnesses, develop a timeline, and anticipate legal issues.
Neutral investigation — As external investigators, we bring independence that internal HR staff cannot. Our lack of relationship to the parties strengthens credibility.
Comprehensive documentation — We maintain detailed interview notes, evidence logs, and analysis. Your file is tribunal-ready.
Ontario expertise — We know OHSA Section 32.0.7, the Human Rights Code, Bill 168, and arbitration standards. Our investigations reflect that knowledge.
Legal coordination — We work alongside your legal counsel to balance fact-finding with privilege protection.
Timely delivery — We complete investigations within 30-60 days, keeping your business moving.
Report clarity — Our findings are clearly stated, well-reasoned, and defensible.

We don't replace your legal counsel. We complement them. While your lawyer advises on legal strategy and privilege, we conduct the investigation that supports that strategy and builds the evidentiary foundation your case needs.

Key Takeaways

OHSA Section 32.0.7 is not optional. Any allegation of workplace violence or harassment triggers your duty to investigate.
"Prompt" means within 24-48 hours of receipt. Delays weaken your investigation and invite regulatory scrutiny.
Reasonableness requires completeness. Witness interviews, document collection, neutral investigator, and detailed documentation are non-negotiable.
Findings demand action. An investigation that doesn't lead to remedial measures is window-dressing, not compliance.
Documentation is your defense. If you cannot show what you investigated and why you concluded what you did, arbitrators assume you didn't investigate fairly.
Independence matters. A neutral, external investigator carries more weight than an internal HR person, especially if conflicts exist.
Timeline matters. Investigations that drag beyond 90 days invite questions about whether you took the obligation seriously.
Anti-retaliation is non-negotiable. Any adverse action against the complainant after a complaint exposes you to a retaliation claim on top of the original claim.

Ready to ensure your investigations meet Ontario's legal standards? Contact 1205 Consulting for a free scoping call. We'll assess your investigation needs, explain our approach, and help you build a defensible, compliant investigation.

Schedule your free consultation

1205 Consulting specializes in workplace investigations under Ontario's OHSA and Human Rights Code. Our investigators are experienced in conducting fair, thorough, tribunal-ready investigations that protect your organization and resolve workplace conflicts.

Ontario Employer Obligations Under OHSA Section 32.0.7: A Compliance Guide