'Ex parte' refers to a court appearance where there is no notice given to another party, for whatever reason. When you do, the law requires that any evidence provided be 'full and fair'.
. Misir v Misir
In Misir v Misir (Ont CA, 2017) the rule about evidence in ex parte motions is set out:
[17] A party who seeks relief from the court in proceedings without notice is obliged to make full and fair disclosure of all material facts. This is a common law rule that is enshrined in rule 39.01(6). See also Sangster v. Sangster, 2003 CanLII 48248 (ON CA), [2003] O.J. No. 69 (C.A.), at para. 7. It is unnecessary to find that the court was deliberately misled before a court will set aside such an order. The basis of the rule is fairness. As the rule confirms, the failure to make such disclosure is a reason, in itself, to set aside the order made: Mariani v. Mariani, [2010] O.J. No. 1464 (S.C.); Balanyk v. Greater Niagara General Hospital, [1997] O.J. No. 4867 (C.A.).
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