The parol evidence rule holds that oral testimony by one party that contradicts a written contract cannot be accepted as evidence in court.

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The parol evidence rule is a legal principle that generally prohibits the introduction of extrinsic or oral evidence to modify, vary or contradict a written contract. When a contract is reduced to writing, it is presumed to represent the final and complete agreement between the parties, and any prior or contemporaneous oral agreements or negotiations are generally excluded from consideration. Therefore, in most cases, if a party attempts to introduce oral testimony that contradicts a written contract, it will be excluded as inadmissible under the parol evidence rule.

The Parol Evidence Rule Holds That Oral Testimony by One