On June 15 2017 the Supreme Court of Canada released its landmark decision in Stewart v Elk Valley Coal Corp (2017 SCC 30), reinforcing the right of employers to take proactive risk mitigation and management measures through alcohol and drug policies to ensure workplace safety.


Ian Stewart worked in a safety-sensitive mine operated by the Elk Valley Coal Corporation, Cardinal River Operations. The employer implemented an alcohol and drug policy, which – among other things – required employees to disclose addiction issues before any alcohol or drug-related incident occurred. Employees who self-disclosed would be offered treatment. Employees who failed to self-disclose in advance of an incident and subsequently tested positive for alcohol or drugs could be terminated.

Stewart was involved in a workplace accident and tested positive for cocaine. During an investigation meeting with his employer following the positive test, he stated that he thought he was addicted to cocaine. He had not disclosed his addiction before the incident. Pursuant to the employer policy, Elk Valley terminated Stewart's employment. Stewart argued that he was terminated for his addiction, which constituted discrimination under Section 7 of the Alberta Human Rights Act (RSA 2000, c A-25.5).

Tribunal decision

The Alberta Human Rights Tribunal held that while Stewart suffered from a disability, namely addiction, he was terminated for breaching the policy, not for his addiction (2012 AHRC 7). Therefore, there was no prima facie discrimination. Further, in the alternative, the discrimination alleged constituted a bona fide occupational requirement and Elk Valley accommodated Stewart's disability to the point of undue hardship. The Court of Queen's Bench and Court of Appeal dismissed the appeal of the tribunal's decision (2013 ABQB 756 and 2015 ABCA 225).

Supreme Court decision

The Supreme Court dismissed the appeal in an eight-to-one decision. Chief Justice McLachlin delivered the majority decision on behalf of herself and Justices Abella, Karakatsanis, Côté, Brown and Rowe. Justices Moldaver and Wagner issued joint reasons, concurring in the result, disagreeing with the majority on the issue of prima facie discrimination but finding that the employer met its obligation to accommodate to the point of undue hardship. Justice Gascon issued dissenting reasons.

Prima facie discrimination The majority found no basis for interfering with the tribunal's decision. The issue was whether the employer terminated Stewart because of his addiction or for breaching the policy prohibiting alcohol and drug use and failing to disclose his addiction. The majority found that the tribunal had thoroughly reviewed all of the evidence and its decision that Stewart was terminated for breach of the policy was reasonable. A key factor in this decision was the finding of fact that Stewart had the capacity to comply with the terms of the policy.

Stewart argued that addiction was a factor in his termination because denial was part of the addiction and prevented him from disclosing his addiction before the accident. The majority, like the tribunal, rejected this argument and stated:

"It cannot be assumed that Mr. Stewart's addiction diminished his ability to comply with the terms of the Policy. In some cases, a person with an addiction may be fully capable of complying with workplace rules. In others, the addiction may effectively deprive a person of the capacity to comply, and the breach of the rule will be inextricably connected with the addiction. Many cases may exist somewhere between these two extremes. Whether a protected characteristic is a factor in the adverse impact will depend on the facts and must be assessed on a case-by-case basis. The connection between an addiction and adverse treatment cannot be assumed and must be based on evidence."(1)

In this case, ample evidence supported the tribunal's conclusion that there was no prima facie discrimination. The majority opined that where the cause of termination is breach of a workplace policy or other conduct attracting discipline, the mere existence of an addiction does not establish prima facie discrimination. Such an interpretation would lead to the conclusion that employers would never be able to sanction addicted employees who fail to comply with a workplace policy, even if there was evidence that the employee could fully comply with the policy but chose not to.

Accommodation Having found no prima facie discrimination, the majority did not consider whether Stewart was reasonably accommodated. However, having found prima facie discrimination, Moldaver and Wagner considered the issue and held that Elk Valley reasonably accommodated Stewart. Stewart's immediate termination was reasonably necessary so that the deterrent effect of the policy was not significantly reduced. The concurring opinion stated:

"Elk Valley's coal mining operation was a 'safety-sensitive environment'. In such a workplace, it was crucial to deter employees from using drugs in a manner that could negatively affect their work performance and potentially lead to devastating consequences. Workplace safety is a relevant consideration when assessing whether the employer has accommodated the employee to the point of undue hardship."(2)

The employer had a valid objective in preventing employees from using drugs in a way that could give rise to "serious harm" in its safety-sensitive workplace (para 55). Lesser measures (eg, subjecting Stewart to an individual assessment or imposing a limited unpaid suspension instead of termination) would have undermined the policy's deterrent effect and compromised the employer's objective. As a result, the tribunal's conclusion that incorporating these aspects of individual accommodation would result in undue hardship was reasonable. The justices also noted that Stewart was offered the opportunity to apply for employment after six months, provided that he completed a rehabilitation programme, which the employer agreed to subsidise subject to certain conditions. There was also evidence that vacant positions would have been available if Stewart had applied. On this basis, Moldaver and Wagner dismissed the appeal.


The Supreme Court majority has affirmed employers' rights to take proactive measures to prevent workplace incidents by implementing and enforcing alcohol and drug policies. Employers can require employees to self-disclose substance abuse issues before workplace incidents and may be able to impose discipline for failure to comply. Employers need not give employees multiple chances to comply with a workplace policy, even if an employee suffers from a disability. Simply having a disability and being subject to a workplace policy or disciplinary action cannot be assumed to constitute discrimination. If expert evidence demonstrates that an employee has the capacity to control his or her behaviour notwithstanding the disability, an employer may still be able to impose discipline on that employee.

More broadly, the decision recognises the unique nature of safety-sensitive workplaces and the critical need to deter alcohol and drug use in such environments. Employers may impose sanctions for breach of safety policies, even when an employee suffers a disability, because to do otherwise would undermine the deterrent effects of the policy. The decision also reaffirms the importance of considering workplace safety in a bona fide occupational requirement analysis of an employer's standard or policy.

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