In a grievance arbitration concerning the discharge of an employee for dishonesty following a last chance agreement, the union sought to introduce expert evidence from a clinical psychologist to establish that the grievor's conduct was attributable to a mental disability.
The employer objected to the admission of the expert evidence, arguing that it was unnecessary, that the psychologist was not properly qualified, and that he lacked objectivity.
The arbitrator applied the Mohan framework and ruled that the expert evidence was admissible, as it could provide relevant information beyond the arbitrator's experience.
The arbitrator also found the psychologist to be properly qualified and held that any concerns regarding his objectivity should be considered when weighing the evidence, rather than as a basis for exclusion.