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Hiring a Third-Party Investigator for Workplace Complaints

9 Jun 2026 4 min read No comments Work & Employment Rights Ontario
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Under the Ontario OHSA, employers must conduct an appropriate investigation into workplace harassment. When a complaint involves high-ranking executives, sexual harassment, or severe toxicity, hiring an external, third-party investigator (such as an HR consultant or employment lawyer) is vital to ensure neutrality and prevent massive legal liability.

When a serious harassment or discrimination complaint lands on a manager’s desk, the immediate reaction is often to try and handle it quietly “in-house.” 💼 While Human Resources departments are perfectly capable of mediating minor interpersonal disputes, complex allegations demand a much higher standard of scrutiny. Investigating a powerful CEO or untangling a deeply rooted toxic culture internally is a recipe for allegations of bias and corporate cover-ups.

Ontario law takes workplace safety incredibly seriously. The Occupational Health and Safety Act (OHSA) legally requires employers to investigate incidents properly. If an employer in Toronto, London, or Mississauga bungles an investigation by acting with bias, the Ministry of Labour or a civil court judge can issue devastating financial penalties. Recognizing when to step back and hire a neutral third-party investigator is a critical skill for any successful business owner.

Step-by-Step Process: When and How to Hire an External Investigator

Choosing to outsource an investigation protects both the complainant and the company. 📋 A structured approach ensures the investigation stands up to rigorous legal scrutiny in court.

Step 1: Triaging the Complaint for Bias

The moment a written complaint is received, management must assess the risk. You must hire an external investigator if the accused is a senior leader, part-owner, or the head of HR themselves. An internal HR manager simply cannot objectively investigate the person who signs their paycheque. Furthermore, allegations of severe sexual harassment or systemic racial discrimination should almost always be outsourced to a specialized professional.

Step 2: Selecting the Right Professional

Not all investigators are equal. 🗂 For a standard behavioral issue, hiring a certified HR consultant is cost-effective. However, if the complaint involves potential human rights violations or constructive dismissal claims that will likely end in a lawsuit, hiring a neutral employment lawyer to conduct the investigation provides the added benefit of “solicitor-client privilege” over certain legal advice.

Step 3: Conducting the Independent Investigation

The external investigator takes full control of the process. They will travel to your workplace or conduct secure Zoom interviews with the complainant, the respondent, and any necessary witnesses. Because they are completely independent from the company’s internal politics, employees are generally much more honest and forthcoming with their evidence.

Step 4: Receiving the Final Written Report

At the conclusion, the investigator provides a comprehensive, confidential written report. This document outlines their factual findings on a “balance of probabilities” and explicitly states whether company policies or the OHSA were violated. The employer then uses this legally sound document to justify their disciplinary actions, ranging from mandatory training to termination for cause.

How Much Does a Third-Party Investigation Cost in Ontario?

Hiring external experts requires a corporate budget, but it is vastly cheaper than losing a high-profile wrongful dismissal lawsuit. 💵 Here is a breakdown of the typical costs in Canadian dollars (CAD).

Type of InvestigatorEstimated Cost in CADBest Suited For
Certified HR Consultant$150 to $300 per hourGeneral bullying, toxic communication, and standard policy violations.
Specialized Employment Lawyer$400 to $800 per hourExecutive misconduct, sexual harassment, and complex Human Rights code violations.
Total Estimated Package$5,000 to $30,000+ totalThe final invoice depends entirely on the number of witnesses interviewed and evidence reviewed.
  • Ministry Orders: If an employer refuses to investigate properly, an Ontario Ministry of Labour inspector can issue a formal order forcing the company to hire a third-party investigator at the employer’s sole expense.
  • Risk Mitigation: Spending $10,000 on a bulletproof investigation report can save a company $100,000+ in severance and punitive damages by proving an employee was legally fired “for cause.”

How Long Does an External Investigation Take?

Thoroughness cannot be rushed, but delays can harm workplace morale. ⏱ A standard third-party investigation involving 3 to 5 witnesses generally takes between 30 and 60 days to complete from the initial interviews to the delivery of the final written report. Highly complex cases with dozens of witnesses or digital forensics can stretch to 90 days or more.

Frequently Asked Questions (FAQ)

Do employees have a legal right to refuse an interview?

Generally, no. Participating in a legitimate workplace health and safety investigation is considered a standard duty of employment in Ontario. If an employee outright refuses to cooperate with an external investigator, they may face disciplinary action for insubordination.

Can the accused employee see the final investigation report?

Under the OHSA, employers must inform both the complainant and the respondent in writing of the results of the investigation and any corrective actions taken. However, they are not legally required to hand over the full, unredacted investigator’s report unless ordered by a court or tribunal.

Can we just fire the accused person immediately to save money?

Firing an employee “for cause” without conducting a proper, procedurally fair investigation is incredibly legally dangerous. If you fire someone based on an unverified rumor, they will likely sue for wrongful dismissal, and Ontario judges severely penalize employers who skip the investigation step.

Who pays for the external investigator?

The employer is 100% legally responsible for paying the investigator’s fees. An employer cannot deduct the cost of the investigation from an employee’s paycheque, nor can they ask the person who filed the harassment complaint to cover the expenses.

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