Supervisor Responsibilities and Due Diligence

Yes. Canadian OHS legislation imposes separate, personal legal duties on supervisors - these are not delegated from the employer and cannot be passed down to workers. Both the employer and the supervisor can be charged for the same incident. Depending on the province, supervisors face personal fines ranging from $100,000 (Ontario) to $750,000 per count (BC) and up to 12–24 months imprisonment. Under Bill C-45 (the Westray Law, Criminal Code ss.217.1, 22.1), supervisors whose negligent direction of work endangers workers' lives can face criminal prosecution resulting in a permanent criminal record - separate from any regulatory fine.

Due diligence is the legal standard that can serve as a defence against an OHS charge. Canadian courts apply a two-part test: the supervisor took all reasonable precautions in the circumstances, and could not reasonably have predicted the specific failure. Critically, the burden of proof sits with the supervisor - once a regulator proves a violation occurred, you must demonstrate due diligence through documented evidence. Specific practices that count include signed pre-task toolbox talk logs, written Field-Level Hazard Assessments (required by Alberta OHS Code Part 2, BC OHS Regulation s.4.27, and Saskatchewan OHS Regulations), training records signed by each worker, and documented follow-up on every hazard report. Good intentions and verbal assurances do not satisfy the standard.

Every Canadian OHS jurisdiction protects a worker's right to refuse work they reasonably believe is likely to endanger themselves or another worker. When a refusal occurs, the supervisor must listen without hostility, immediately investigate the concern with the worker present, and document the investigation and outcome. Critically, the supervisor must not assign the refused task to a different worker until the hazard has been properly assessed - doing so is itself an offence in most provinces. Threatening, pressuring, or disciplining a worker for exercising this right is a personal offence under Ontario OHSA ss.43–45, BC OHS Regulation ss.3.12–3.14, and Alberta OHS Act ss.31–35.

Immediately after securing the scene and ensuring worker safety, a supervisor is legally required to preserve the incident scene in most provinces - do not move, alter, or clean up equipment or materials until authorized by a regulator. Ontario OHSA s.51, BC OHS Regulation s.3.56, and Alberta OHS Act s.40 all require the scene to be preserved pending possible ministry inspection for serious injuries or fatalities. The supervisor must notify the employer without delay, identify and separately interview all witnesses before their memories are influenced by group discussion, and collect documentation including the pre-task hazard assessment, training records for involved workers, and equipment inspection logs.

Yes, and failure to enforce procedures is the most common - and most legally dangerous - supervisor failure mode identified in Canadian OHS prosecutions. 'The workers prefer it that way' and 'I didn't want to slow things down' are not legal defences. Under the Internal Responsibility System that operates in every Canadian jurisdiction, supervisors have a duty to implement the employer's safety program and ensure workers follow it; this duty cannot be passed down to workers. If a procedure genuinely creates operational problems, the appropriate path is to raise it through the employer or JHSC to have it reviewed - not to quietly permit bypasses, which creates personal liability for the supervisor.