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Parol evidence rule. The parol evidence rule is a substantive common law rule in contract cases that prevents a party to a written contract from presenting extrinsic evidence that discloses an ambiguity and clarifies it or adds to the written terms of the contract that appears to be whole.
A patent ambiguity exists when the uncertainty appears on the face of the will. Traditionally, parol evidence was not admissible to clarify a patent ambiguity. See, e.g., Jacobsen v. Farnham, 53 N.W.2d 917 (Neb. 1952). The modern view is to also admit parol evidence in these instances.he uncertainty arises from the fact that it is not ascertainable who Wilma meant. To assist in clearing up this confusion, extrinsic evidence would be admissible to resolve this latent ambiguity. See, .e.g., Nicholl v. Bergner, 63 N.E.2d 828 (Ohio 1945); Bond v. Riley, 296 S.W. 401 (Mo. 1927).