Rules on Civil Procedure
Section 2. Scope of examination. - Unless otherwise ordered by the court as provided by section 16 or 18 of this Rule, the deponent may be examined regarding any matter, not privileged, which is relevant to the subject of the pending action, whether relating to the claim or defense of any other party, including the existence, description, nature, custody, condition, and location of any books, documents, or other tangible things and the identity and location of persons having knowledge of relevant facts. (2, R24)