During a grievance arbitration, the union sought to introduce evidence of two prior incidents involving a witness to demonstrate workplace culture.
The employer objected, arguing the evidence was improper propensity evidence.
The arbitrator ruled that the evidence could not be admitted to show propensity.
However, because the employer had put workplace culture in issue, evidence of one incident was admitted as relevant to that issue.
Evidence of the second incident was excluded as irrelevant to the characterization of the work environment.