Oral evidence introduced after a contract is signed may be legally accepted if it clarifies some point in a written agreement.

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This is a principle known as the Parol Evidence Rule, which allows for oral evidence to be used to clarify or supplement a written agreement, but not to contradict or alter it. This is based on the idea that the parties intended the written agreement to be the final expression of their agreement and thus any prior oral agreements are considered irrelevant. However, if the written agreement is ambiguous, incomplete or uncertain, then oral evidence may be used to clarify it.

Oral Evidence Introduced After a Contract Is Signed May Be