OEMAC’s 2025 Position on Cannabis Use in Safety-Sensitive and Decision-Critical Work

OEMAC Position on Safety Sensitive Work

The Occupational and Environmental Medical Association of Canada (OEMAC) has released an updated 2025 position statement addressing the implications of cannabis use in the workplace - specifically within safety-sensitive and decision-critical roles. These roles require high cognitive function and judgment, and impairment can lead to serious safety, performance, or interpersonal consequences. 

Co-authored by DriverCheck’s own Chief MRO, DR. Melissa Snider-Adler, OEMAC confirms that cannabis causes impairment that may persist beyond the period of intoxication. Effects on memory, attention, coordination, and reaction time can linger for hours or days, particularly in frequent users. Cannabis is also associated with withdrawal symptoms and, in some cases, addiction. Because THC is fat-soluble, it accumulates in the body, increasing the risk of prolonged impairment. 

The duration of cannabis impairment is highly variable. Research studies show inconsistent timelines - ranging from a few hours to several days - depending on product strength, frequency of use, and individual differences. Real-world cannabis use often involves higher doses than those studied, further complicating risk assessment. 

As a result of accumulated scientific evidence gathered, OEMAC reasserts that workers should refrain from performing safety-sensitive or decision-critical tasks for a minimum of 24 hours after cannabis use, and employers should treat any lingering concerns seriously. 

The statement also encourages employers to update workplace drug and alcohol policies, train staff on impairment risks, and support access to treatment when needed. OEMAC emphasizes the need for further research that reflects real-world cannabis use and its impact on workplace safety. 

Read the full OEMAC position statement here.