What will a court use to determine if a contract is void or voidable? Multiple choice question. The court will not admit parol evidence under any circumstances. The court will admit parol evidence to determine if a contract is void or voidable. The court will not admit any additional evidence, but will look at the contract "as is" to determine if the contract is void or voidable. The court will only admit evidence to prove a contract exists, but not to determine if it is void or voidable