Can My Employer Stop Me From Using Cannabis? Your Rights Explained

By Whitten & Lublin  |  October 2, 2026

Can my employer stop me from using cannabis is a question many employees and employers in Canada are now asking.  Although recreational cannabis is legal across Canada, that does not necessarily mean employers cannot place limits on off-duty cannabis use. In some workplaces, particularly safety-sensitive industries, employers may be able to restrict employees’ recreational cannabis use outside working hours where it is reasonably necessary to protect workplace safety.

A recent Quebec tribunal decision in Syndicat Canadien de la Fonction Publique, Section Locale 4041 v. Air Transat (Air Transat), 2026 CanLII 44306 confirms that, in the right circumstances, workplace cannabis policies restricting off-duty cannabis use may be legally enforceable if they strike an appropriate balance between employee privacy rights and workplace safety. For employees in safety-sensitive roles and for employers responsible for policy drafting and enforcement, that balance has practical consequences even when the cannabis use happens away from work.

Quick Overview (TL;DR:)

Although recreational cannabis is legal in Canada, employers may be able to restrict off-duty cannabis use where legitimate workplace safety concerns exist. The Air Transat decision confirms that employers in safety-sensitive industries can implement reasonable cannabis policies when they appropriately balance workplace safety with employee privacy rights. This article explains when those restrictions may be justified, how the Air Transat reasoning may apply beyond aviation, and what the decision means in practice for Canadian employees and employers. This article explains when those restrictions may be justified, how the Air Transat reasoning may apply beyond aviation, and what the decision means in practice for Canadian employees and employers.

Can my employer stop me from using cannabis?

Sometimes. Employers may restrict off-duty cannabis use where the restriction is reasonably necessary to protect workplace safety, particularly in safety-sensitive positions. Whether a workplace cannabis policy is enforceable depends on whether it reasonably balances employee privacy rights with legitimate safety concerns.

Can employers restrict off-duty cannabis use?

The answer depends on the nature of the employee’s work and the employer’s reasons for imposing the restriction.

In the Air Transat case, the airline implemented a workplace policy in 2018 prohibiting employees in high-risk positions from consuming any drug, whether legal or illegal, at any time, including during their personal time. The prohibition extended to unionized employees, including flight managers, flight attendants and trainers (the Cabin Crew). Thus, the union brought a grievance challenging this policy, arguing that it improperly interfered with employees’ privacy and personal autonomy.

In deciding whether the policy was enforceable, the tribunal balanced two competing interests: the employer’s obligation to protect the safety of employees and the travelling public, and employees’ rights to privacy and autonomy outside of work.

What happened in the Air Transat case?

The tribunal upheld Air Transat’s policy and dismissed the union’s grievance. This decision shows a widespread acceptance that ensuring the safety of employees and the public will outweigh the infringement experienced by employees who might otherwise wish to partake in recreational drug use during their personal time.

Why did the tribunal uphold Air Transat’s off-duty cannabis policy?

There are two competing interests at stake: 

• The employer’s obligation to ensure the safety and security of their employees and the public
• The employees’ rights to privacy and personal autonomy. 

In making its decision, the tribunal assessed whether the policy struck a reasonable balance of interests between the employer’s workplace safety obligations and employees right to privacy and concluded that it did. 

1. Workplace safety and cannabis impairment were an important and legitimate objective

The tribunal accepted that Air Transat’s obligation to guarantee the safety of all passengers and employees on board an aircraft was both a legitimate and important objective. 

Expert evidence confirmed that cannabis use can impair an individual’s reaction time, judgement, short-term memory, decision-making skills and concentration. The nature of the aviation industry requires employees to be at full capacity and thus justifies the employer regulating  off-duty cannabis use to reduce the risk of impairment at work. 

2. The policy was proportionate to the objective

Although the policy infringes on the affected employees’ right to privacy and personal autonomy, the tribunal found this infringement proportionate to the objective of safety.

The tribunal noted that cannabis had varying effects on individuals, and currently there is an absence of reliable screening tools to assess functional capacity. Thus, these factors supported the total prohibition implemented by Air Transat for employees working in a safety-sensitive position.  

3. The impact on employee privacy was limited

Lastly, the tribunal concluded that the policy minimally infringed on flight attendants’ right to privacy. 

While other case law has characterized random drug screenings as intrusive, the arbitrator found that a workplace policy restricting off-duty cannabis use did not amount to the same level of intrusion.

Does this decision apply to every workplace?

This decision does not mean every employer can prohibit off-duty cannabis use. Whether a workplace policy is enforceable will depend on the nature of the work, the level of safety risk involved, and whether the restriction is reasonable and proportionate in the circumstances.

In the case of Air Transat, the safety-sensitive nature of the aviation industry heavily influenced the decision in this case.  

What does this decision mean for employees?

The tribunal ultimately dismissed the union’s grievance and upheld Air Transat’s policy.

The decision confirms that employers may, in appropriate circumstances, regulate off-duty cannabis use where legitimate workplace safety concerns outweigh an employee’s privacy interests. While recreational cannabis is legal in Canada, employees working in safety-sensitive positions should not assume that legalization prevents employers from imposing reasonable workplace cannabis policies. In Ontario, for example, smoking cannabis is prohibited in enclosed workplaces, which shows that legalization does not eliminate all workplace restrictions under applicable laws.

Medical Marijuana and Workplace Rights

Medical marijuana has been legally available in Canada for nearly two decades and is distinct from recreational cannabis use. Employees who use medical cannabis typically do so under the supervision of a healthcare provider and often have prescriptions to treat specific health conditions. Employers have a legal duty to accommodate employees using medical marijuana as part of their treatment, provided that accommodation does not cause undue hardship to the workplace.

In Ontario, medical cannabis use is protected under human rights legislation, meaning employers must make reasonable accommodations such as modifying work duties or allowing breaks for medication use. However, employees must disclose their medical cannabis use if it could cause impairment that affects workplace safety, particularly in safety-sensitive roles. Employers may require medical documentation to support accommodation requests but must respect employee privacy and confidentiality.

While medical cannabis is legal and protected, impairment at work remains prohibited. Employers can implement drug testing policies for cause in safety-sensitive positions, but random testing must comply with human rights standards. The distinction between medical and recreational cannabis use is critical, as accommodation duties apply only to medical use, not recreational use. Understanding these nuances helps both employees and employers navigate workplace cannabis policies effectively.

Key takeaways

• Employers may restrict off-duty cannabis use where workplace safety justifies the policy. 
• Safety-sensitive positions are more likely to support restrictions on recreational cannabis use. 
• Workplace cannabis policies must reasonably balance employee privacy with safety obligations. 
• Whether a policy is enforceable depends on the specific workplace and the level of safety risk involved. 

How Whitten & Lublin can help

Workplace cannabis policies continue to evolve as employers seek to balance workplace safety with employee privacy rights. If your employer has introduced restrictions on off-duty cannabis use or you are unsure whether a workplace cannabis policy is legally enforceable, the employment lawyers at Whitten & Lublin can help you understand your rights and options. 

Contact us online or call (416) 640-2667 to discuss your situation

Frequently Asked Questions

Can my employer stop me from using cannabis?

Yes, in some circumstances. Employers may restrict off-duty cannabis use where the policy is reasonably necessary to protect workplace health and safety, particularly in safety-sensitive roles involving operating heavy machinery or other high-risk tasks. Such policies aim to prevent workplace impairment from cannabis products that may affect an employee’s ability to perform safely and effectively.

Can my employer control what I do outside of work?

Generally, no. However, employers may regulate off-duty conduct, including the use of cannabis and other intoxicating substances, where it directly impacts workplace health, safety, or an employee’s ability to perform essential job duties. This includes concerns about workplace impairment and the potential negative effects of consuming cannabis on job performance.

Can I be disciplined for using cannabis outside of work?

Possibly. This issue can be more complex when the employee is using medical marijuana for medical purposes, which is legal in Ontario with a prescription. Employers have a duty to accommodate medical cannabis use related to a disability unless doing so would cause undue hardship. However, employees in safety-sensitive positions may be subject to workplace policies restricting off-duty cannabis use if those policies are reasonable and legally enforceable to ensure workplace health and safety.

Does legal cannabis mean employers cannot restrict its use?

No. Although Canada legalized cannabis for recreational purposes on October 17, 2018, employers may still implement reasonable workplace policies restricting cannabis smoking or other forms of cannabis use to protect workplace health and safety. Such policies are especially important in roles where impairment could lead to accidents or harm, consistent with cannabis laws and occupational health standards.

What is a safety-sensitive position?

A safety-sensitive position is one where impairment from cannabis or other drugs could create a significant risk of harm to the employee, coworkers, customers, or the public. This includes roles involving operating heavy machinery, driving, or other tasks where alertness and coordination are critical to maintaining health and safety in the workplace.

Can employers require employees to be drug-free outside of work?

In limited circumstances. Courts and tribunals have recognized that employers may impose restrictions on off-duty cannabis use where necessary to address legitimate workplace safety risks. In safety-sensitive positions, employers may also require drug testing for cause based on reasonable suspicion of workplace impairment. Random testing may be allowed only in limited circumstances and must comply with human rights obligations and respect privacy, balancing safety with employee rights.