Tests showed worker had double the concentration limit permitted by workplace policy
![Positive test for cannabis cause for discipline, but not dismissal](https://cdn-res.keymedia.com/cdn-cgi/image/f=auto/https://cdn-res.keymedia.com/cms/images/ca/126/0438_638737649570666603.png)
“An arbitrator is going to need evidence of impairment to uphold termination for a failed post-incident drug test, so when incidents happen, the people observing must ask questions about whether there are any signs of impairment - and you may need expert evidence on impairment.”