R 792.10239 Interrogatories to partiesRule 239.
(1) A party to a proceeding may serve upon all adverse parties written interrogatories to be answered by the party to whom the interrogatories are directed.
(2) Interrogatories shall be answered separately and fully in writing under oath. If an interrogatory is objected to, the reasons for objection shall be stated in place of an answer. The answers shall be signed by the person making them and shall contain information that is available to the party served or that could be obtained by the party from its employees, agents, representatives, or persons who may testify on the party's behalf. The party to whom the interrogatories are directed shall serve a copy of the answers on the party or the party's attorney or authorized representative submitting the interrogatories and on all other parties or their attorneys or authorized representatives within 28 days after service of the interrogatories.
(3) If any of the interrogatories have not been answered within the time specified under subrule (2) of this rule, then the tribunal, on motion and for good cause shown, may issue an order compelling a response. A party who fails to answer interrogatories pursuant to an order of the tribunal may be placed in default as provided by R 792.1023.
(4) To the extent that answers are admissible as evidence before the tribunal, answers to interrogatories may be used against the party making them, and an adverse party may introduce an answer that has not been previously offered in evidence by a party.
(5) A person who answers interrogatories is not the witness of the party who submits the interrogatories.
(6) By tribunal order, interrogatories may be limited, as justice requires, to protect the answering party from annoyance, expense, embarrassment, oppression, or violation of a privilege.
(7) A party who has given a response that was complete when made is not under a duty to supplement the response to include information thereafter acquired, unless provided by the tribunal, except as follows:
(a) To supplement the response with respect to any question directly addressed to the identity and location of persons having knowledge of discoverable matters, or the identity of each person expected to be called as a witness at the hearing, the subject matter on which the witness is expected to testify, and the substance of the witness's testimony.
(b) To amend a prior response that the party knows was incorrect when made based on information obtained by the party, or to amend a prior response that was correct when made, but that is no longer true and failing to amend the response is, in substance, a knowing concealment.