§4871.  Relevancy only ground of objection to evidence or production of documents

The sole ground on which the defendant may object to any question asked him or any other party as a witness, or to the introduction in evidence of any document, or to the production in court or to the clerk of any document in response to a subpoena duces tecum directed to him, shall be that the information sought by the question or contained in the document is not relevant to any matter with respect to which the action is pending.  The court shall not exclude any question or document if it appears that the information may possibly relate to any matter with respect to which the action is pending.