Workplace Impairment in Ontario: What Every Employer Must Have in 2026
5 min read
Workplace impairment — whether from cannabis, alcohol, prescription drugs, or fatigue — is one of the most urgent and legally complex health and safety issues facing Ontario employers in 2026. Since the legalization of recreational cannabis in 2018, the number of employer inquiries about impairment programs has grown sharply. Yet many Ontario businesses still lack a compliant, documented impairment policy. Under the Occupational Health and Safety Act, employers have a legal duty to take every reasonable precaution to protect workers — and allowing workers to perform safety-sensitive tasks while impaired is a direct violation of that duty. Here is what your workplace must have in place.
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Every Ontario employer should have a written workplace impairment policy that covers all substances — cannabis, alcohol, prescription medications, and non-prescription drugs
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Your policy must clearly define 'safety-sensitive positions' and the specific rules that apply to workers in those roles, including zero-tolerance provisions where appropriate
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Under the Ontario Human Rights Code, addiction is a protected disability — employers cannot discipline workers solely for having a substance use disorder; they must first offer accommodation up to undue hardship
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Reasonable cause and post-incident drug/alcohol testing may be permissible in safety-sensitive environments, but random testing remains legally restricted in Ontario — get legal advice before implementing a testing program
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Supervisors must be trained to recognize signs of impairment and document observations objectively — subjective or poorly documented decisions expose you to human rights and wrongful dismissal claims
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Your impairment policy must align with both your OHSA obligations and the Ontario Human Rights Code — these two frameworks pull in different directions, and a well-drafted policy navigates both
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Workers must be informed of your impairment policy — distributing it during onboarding and requiring a signed acknowledgement is your evidence of due diligence
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Review and update your impairment policy annually — this area of law is still evolving, and what was defensible in 2022 may not meet the standard in 2026
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