Workplace investigations derive their credibility from evidence, and the most reliable evidence is often that which exists before anyone knows an investigation has begun. Documentary evidence forms the backbone of any fair investigation, providing objective contemporaneous records that can corroborate or contradict the accounts that witnesses will later provide. For human resources professionals, business owners, and people managers across Canada, understanding how to identify, preserve, and gather documentary evidence before conducting interviews represents one of the most critical skills in the investigative toolkit. This lesson examines the legal framework that governs evidence gathering in Canadian workplaces, explores the practical considerations that arise when collecting documents, and provides guidance on how to approach this phase of an investigation with both rigour and fairness.
The legal authority to gather documentary evidence in workplace investigations stems from the employment relationship itself and from the statutory obligations that Canadian employers must fulfill. Under the common law that applies in British Columbia, Alberta, Saskatchewan, Ontario, and other provinces outside Quebec, employers have an implied right to manage their workplaces, which includes the authority to investigate misconduct and maintain order. This managerial prerogative, however, must be exercised in accordance with the duty of good faith that courts have recognized as fundamental to the employment relationship. In Quebec, the Civil Code governs employment relationships and similarly requires that employers act in good faith when exercising their rights, including the right to investigate. The distinct civilian tradition in Quebec means that employers in that province must be particularly attentive to the codified nature of their obligations, though the practical implications for evidence gathering remain broadly similar to those in common law jurisdictions.