The grievor, a liquor store manager, was previously reinstated subject to strict terms akin to a last chance agreement.
He was discharged after arriving nearly two hours late for a shift on a busy holiday weekend and failing to notify management.
The union argued the lateness was innocent absenteeism caused by sedation from taking Tylenol for a recurrence of a back injury.
The arbitrator rejected this explanation, finding the grievor's testimony regarding the amount of Tylenol taken to be inconsistent and not credible, and noting that Tylenol does not cause sedation.
The arbitrator also found the grievor's failure to notify management unacceptable.
As the grievor's conduct was culpable and gave cause for discipline, the discharge was upheld under the terms of the prior reinstatement.