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Positive urine test alone not enough to prove cannabis impairment, arbitrator rules

by Todd Humber February 19, 2026

written by Todd Humber February 19, 2026

A railway worker's 30-day suspension has been overturned after an arbitrator found that a positive urine test for THC metabolites — without other evidence of impairment — does not justify…

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Todd Humber

Todd Humber is an award-winning workplace journalist who has been covering the HR, employment law, and workplace safety beats for 25 years. He is the publisher and editor-in-chief at Safety News Canada, published by North Wall Media.

Positive urine test alone not enough to prove cannabis impairment, arbitrator rules

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