Parry Sound (District) Social Services Administration Board v. Ontario Public Service Employees Union, Local
324 (O.P.S.E.U.)  2 S.C.R. 157
Parry Sound v OPSEU is about a probationary employee fired shortly after taking maternity leave. She filed a grievance, and the issue was one of jurisdiction. The employer argued that she could not grieve the dismissal due to the collective agreement which held that probationary employees “may be discharged at the sole discretion of and for any reason satisfactory to the Employer and such action by the Employer is not subject to the grievance and arbitration procedures and does not constitute a difference between the parties.”
The Board of Arbitration ruled that it had jurisdiction to hear the case. The Court reversed the ruling of the Board, stating that the board can hear human rights complaints only if it had jurisdiction to hear a grievance, which in this case it did not. The Court of Appeal reversed the ruling of the Court. Rather than stating that the Court was incorrect, it referred to the Employment Standards Act (ESA) which forbids employers from dismissing employees for pregnancy leave and states that the ESA is enforceable as if it were part of the collective agreement
The SCC supported the ruling of the Court of Appeal but was split.