The union grieved the discharge of a Fire Inspector, alleging it was without just cause and a reprisal for exercising rights under the Occupational Health and Safety Act.
The union sought to adduce evidence of events dating back over a decade to establish a pattern of improper conduct.
The employer raised a preliminary objection, arguing the evidence should be limited to events occurring within three years of the grievance, relying on the Board's 'rule of thumb'.
The Board upheld the employer's objection, finding no reason to depart from the three-year rule and noting that many of the older events had already been the subject of prior complaints and settlements.
The Board restricted the evidence to events within three years of the grievance, with a limited exception allowing reliance on the documents establishing the prior settlements.