What is the parol evidence rule?

The parol evidence rule is a rule of contract law in the state of Washington. The rule is designed to protect the written terms of an agreement between the parties. It states that if all the terms of a contract are set out in writing, any prior or contemporaneous oral or written agreements are not allowed to be used in court to alter the meaning of the written agreement. This rule is supported by Washington’s Uniform Commercial Code and is based on the idea of honoring the “meeting of the minds” that is reflected in the written document. The rule is focused on the intent of the contracting parties and the will of the parties as they entered the agreement. Basically, parol evidence must be consistent with the writing and therefore, inadmissible. This rule protects the parties from any misunderstandings or fraudulent actions. This rule is not absolute and under some circumstances, oral statements are admissible. This can happen if the writing does not cover a certain subject matter, or if the contract does not fully incorporate all terms in writing, or if the written contract is unclear or ambiguous in a particular area. Parol evidence can also be used to show fraud, misrepresentation, undue influence, or mistake by either party in the contract.

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