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  May 16, 2017

Marijuana At Work: Six Things Employers Should Know

The Canadian government has legalized marijuana for non-medical use. The rapid and significant changes to the legal status of marijuana raise new questions and challenges for Canadian employers.

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Here, we provide a general overview of the most important things employers should know about marijuana in the workplace:


The Government of Canada legalized recreational use of marijuana on October 17, 2018. A year later, in October 2019, the production and sale of edible cannabis and cannabis extracts was legalized.


No. Employers have the right to set rules for non-medical use of marijuana in the workplace in much the same way that employers currently set rules for use of alcohol. In particular, employers may prohibit the use of marijuana at work or during working hours and may also prohibit employees from attending work while impaired. Workplace rules regarding non-medical use of marijuana may be enforced through the application of the employer’s progressive discipline policy.


Yes. The duty to accommodate, as required by provincial and federal human rights legislation, extends to disabled employees who use medical marijuana. These employees are to be accommodated in the same way as an employer accommodates any other disabled employee who has been prescribed medication. Accommodation is also required for employees who may have an addiction disability. However, the duty to accommodate is not without limits.


Human rights legislation requires that a disabled employee be accommodated. What, precisely, does this mean in the context of medical marijuana? As a starting point:

  • A prescription for medical marijuana does not entitle an employee to be impaired at work;
  • A prescription for medical marijuana does not entitle an employee to compromise his or her safety, or the safety of others;
  • A prescription for medical marijuana does not entitle an employee to smoke in the workplace; and
  • A prescription for medical marijuana does not entitle an employee to unexcused absences or late arrivals.

The employer is, however, required to attempt to find reasonable workplace accommodation for disabled employees who have a prescription for medical marijuana use, just as would be required for any other disabled employee with a medical drug prescription.


Employers need to ensure their workplace policies address drug and alcohol use, with attention to two competing obligations: on the one hand, employers have a duty to accommodate disabled employees, and medical marijuana is used to treat medical conditions that can constitute a “disability”.  On the other hand, employers must take every reasonable precaution to ensure the safety of their workplaces and they continue to have the right to prohibit impairment on the job. Assessment of impairment at work may prove to be the most difficult aspect of designing and implementing policies regarding use of marijuana, as testing for drug and alcohol use remains one of the most contentious contemporary issues in Canadian workplace law.

Employers faced with an accommodation request may wish to consider providing similar accommodation measures it does for other disabled employees. These measures may include moving the employee out of a safety-sensitive position, providing more frequent breaks, implementing alternative scheduling; or altering the employee’s duties, etc. As with other accommodated employees, an employer may wish to request medical information from the employee’s doctor, or seek the assistance of an independent medical examiner where there are questions about the employee’s fitness for duty, and what will be appropriate accommodation.

Four cases regarding medical use of marijuana shed light on how employers should strike the appropriate balance between these competing obligations.

In French v. Selkin Lodging, 2015 BCHRT 101, the complainant, a cancer survivor, often smoked marijuana several times throughout the workday to manage chronic joint pain.  Although a doctor had told the complainant he could use marijuana if it worked, the complainant did not have any formal documentation permitting him to lawfully possess and use marijuana for medical purposes.  Prompted by safety concerns, the employer told the complainant he could not continue working if he continued smoking at work.

Although there was no evidence that marijuana use had ever affected the complainant’s performance, the British Columbia Human Rights Tribunal concluded that the employer’s “zero-tolerance policy” was a bona fide occupational requirement.  The Tribunal found that the dismissal was not discriminatory.

An Alberta arbitration board came to the opposite conclusion in Calgary (City) v. Canadian Union of Public Employees, 2015 CanLII 61756 (AB GAA).  In this case, the grievor was responsible for operating a grader on city streets.  To address pain caused by a back injury, he obtained a permit for medical marijuana and began using small amounts at night before going to bed.  After the grievor underwent an Independent Medical Examination (“IME”), the employer decided the grievor could no longer occupy a safety-sensitive position.

The board of arbitration found that the IME was based on inaccurate information from the employer.  Most notably, there was no evidence of substance abuse or impairment at work.  Accordingly, the employer was ordered to reinstate the grievor to his former position.

In M v. V Gymnastics Club, 2016 BCHRT 169, a gymnastics coach claimed that her employer had discriminated against her on the basis of physical and mental disability by suspending her employment when she disclosed she used medical marijuana to manage the symptoms of her gastric conditions. The complainant said she was never “stoned” at work and that there was no discernible impact of her marijuana use at the workplace. The employer said it was entitled to demand complete abstention from consuming marijuana, both at work and away. It described the position of gymnastics coach as being safety-sensitive, saying that gymnastics presents a very real risk of injury and that most of the individuals with whom the complainant worked were children under the age of 19. The British Columbia Human Rights Tribunal declined to dismiss the complaint on a preliminary basis, concluding that a full hearing was necessary to determine whether the role of gymnastics coach was indeed a safety-sensitive position and whether the complainant had been accommodated to the point of undue hardship.

In Orange Air v Office and Professional Employees International Union, 2021 CanLII 126376, a federal arbitrator determined that an employer’s zero-tolerance policy could have been modified without imposing undue hardship. The grievor was in a safety-sensitive workplace, and was prescribed medical marijuana. Originally, the employer accommodated the grievor by having him do non-safety sensitive work, but declined to continue doing so after the grievor’s treatment was extended for six additional months. An independent medical examination determined the grievor was capable of performing safety-sensitive duties while continuing medical marijuana treatment. Therefore, the arbitrator found the zero-tolerance policy regarding marijuana use to be unreasonable, notwithstanding the safety-sensitive nature of the workplace.

Employers may wish to seek legal guidance on whether – and how – to accommodate an employee who has been prescribed medical marijuana, as each individual case depends on the specific circumstances.


The changes to the legal status of marijuana have created unique and unprecedented challenges for employers. It may seem daunting; however, employers need not change their practices drastically. To accommodate an employee who uses medical marijuana, an employer can start by mirroring the practices it has developed for accommodating any employee who has been prescribed drugs that have the potential to impact or impair his or her work. To limit the use of non-medical marijuana at work, an employer can look to existing practices related to use of alcohol, other prescription drugs or cigarettes.

Nevertheless, there will continue to be some changes. It is likely that zero tolerance workplace policies for marijuana use or possession will become unenforceable. We may also see employees begin to request or negotiate for coverage under health and benefits plans for medical marijuana prescriptions.

With more time, however, many issues and uncertainties surrounding the use of marijuana will continue to be litigated. We will be provided with lessons from the Courts and tribunals as to how an employer can best ensure that it fulfills its human rights obligations, while also ensuring the workplace remains safe and productive.

This article was provided by Ryan Anderson, an employment lawyer with Mathews Dinsdale & Clark LLP. The information provided in this article is necessarily of a general nature and must not be regarded as legal advice. For more information about Mathews Dinsdale & Clark LLP, please visit mathewsdinsdale.com.

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