A workplace cannabis test can raise a genuine safety concern, but employers need to distinguish the test result from the conduct their rule prohibits. Private use, possession at work, working while impaired and fitness for a safety-sensitive role are not identical questions.
Hugh Raichlin Attorneys assists employers with workplace policies, investigations and disciplinary disputes. A defensible approach begins with the actual job and evidence, rather than either of the sweeping assumptions that private use can never matter at work or that any positive result automatically warrants dismissal.
Define the legitimate workplace requirement
Identify the task, the risk and the rule relied upon. The standard appropriate to an employee operating dangerous equipment may differ from the assessment of an office role. Explain why the restriction is connected to the work rather than relying only on the employer’s general industry description.
Policies should distinguish prohibited conduct and fitness requirements clearly. Employees need to understand the rule and the process that follows a concern. A broad “zero tolerance” heading does not remove the need to justify its application or the eventual sanction.
A test result has a particular evidential meaning
Ask what the test measures, how it was performed and what inference can properly be drawn. Record timing, method, confirmation and relevant observations. Do not describe a result as proof of present impairment without an adequate basis.
The original source article contrasted different workplace situations. A later Labour Appeal Court decision, Enever v Barloworld, also addressed the importance of context: the court found fault with the application of a cannabis policy to an office employee where impairment or the relevant safety risk was not established. The judgment expressly distinguished potentially different circumstances involving impairment or dangerous machinery. It should not be turned into an instruction to ignore safety risks.
Investigate before deciding
Give the employee an opportunity to respond to the allegation and evidence. Consider what was consumed, when and whether relevant medical information or expert assistance is needed. Keep health information restricted to those who need it for the issue being assessed.
Where immediate fitness concerns arise, take proportionate lawful safety steps and record the reasons. Separating that protective response from the disciplinary outcome helps avoid presenting a precaution as a completed finding of guilt.
Prepare the evidence file
- The policy version, training and proof of communication.
- The job description and specific risk assessment.
- Testing method, records and available confirmation.
- Contemporaneous observations relevant to the alleged breach.
- The employee’s explanation and relevant supporting information.
- Consistency, prior relevant incidents and reasons for the proposed outcome.
Avoid charging one offence and deciding another. If the allegation is possession, impairment, refusal of a lawful instruction or a policy breach, identify it accurately and explain the evidence required. Do not assume that a medical explanation either ends the enquiry or is inherently dishonest.
Review the rule as well as the individual case
A dispute may reveal that the policy uses imprecise language or treats materially different jobs identically without explanation. Review that prospectively through a proper process. Do not retrospectively rewrite the rule to fit an incident already under investigation.
The appropriate response must consider substantive and procedural fairness. Where dependency, incapacity or another health-related issue is raised, advice may be needed about the correct process in addition to ordinary misconduct procedures.
Questions employers ask
Does lawful private use prevent workplace discipline?
Not automatically. The particular conduct, workplace rule, role and evidence still require assessment. Private use is not a permission to work while impaired or disregard a justified safety requirement.
Is every positive result proof of impairment?
No. The test’s evidential meaning and the surrounding facts matter. Obtain suitable advice before making claims the test does not establish.
Can a standard policy guarantee a successful dismissal?
No document guarantees that result. HRA can help assess the policy, investigation and hearing process against the facts, and assist with a resulting dispute where appropriate.
Related legal assistance
General information, not legal advice on a particular matter. The documents, facts and applicable law determine the appropriate next step.