Positive urine test insufficient to prove cannabis impairment for railway worker: Arbitrator

Positive urine test insufficient to prove cannabis impairment for railway worker: Arbitrator

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PREMIUMPositive urine test insufficient to prove cannabis impairment for railway worker: Arbitrator

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In a February 2026 ruling, a federal arbitrator overturned a 30-day suspension and mandatory random drug testing for a

Toronto Terminals Railway

signal maintainer, concluding that a positive urine test alone does not prove impairment. 

HR Law Canada

• Urinalysis Limitations: Arbitrators ruled that while a urine test can detect THC metabolites, it only indicates past consumption (potentially days or weeks prior) and cannot determine acute impairment at the time of a workplace incident.
• Contradictory Test Results: In the 2026 case, the worker’s breathalyzer and oral fluid swab were both negative. Negative oral fluid tests are considered evidence that a worker was not acutely impaired during the shift.
• Observation Evidence: A post-accident observation form recorded “normal” results for balance, walking, awareness, and speech. The arbitrator found the worker’s “nervousness” following the accident to be an unremarkable reaction rather than a sign of drug use.
• Legal Precedents: The ruling applied a “unimpaired” line of railway jurisprudence, including a September 2024 decision involving a Canadian Pacific Kansas City (CPKC) locomotive engineer. In that case, a 30-day suspension was also quashed because the worker was candid about off-duty use and showed no signs of on-duty impairment.
• Random Testing Quashed: Because no impairment was established, the arbitrator ruled there was no legal basis to enforce ongoing random drug testing or substance abuse assessments as a condition of continued employment. 
  
• HR Law Canada +7