Art. 1425. Experts; pretrial disclosures; scope of discovery

            A. A party may through interrogatories or by deposition require any other party to identify each person who may be used at trial to present evidence under Articles 702 through 705 of the Louisiana Code of Evidence.

            B. Upon contradictory motion of any party or on the court's own motion, an order may be entered requiring that each party that has retained or specially employed a person to provide expert testimony in the case or whose duties as an employee of the party regularly involve giving expert testimony provide a written report prepared and signed by the witness. The report shall contain a complete statement of all opinions to be expressed and the basis and reasons therefor and the data or other information considered by the witness in forming the opinions. The parties, upon agreement, or if ordered by the court, shall include in the report any or all of the following: exhibits to be used as a summary of or support for the opinions; the qualifications of the witness, including a list of all publications authored by the witness within the preceding ten years; the compensation to be paid for the study and testimony; a listing of any other cases in which the witness has testified as an expert at trial or by deposition within the preceding four years.

            C. If the court orders the disclosures of Paragraph B of this Article, they shall be made at the times and in the sequence directed by the court. In the absence of directions from the court or stipulation by the parties, the disclosures ordered pursuant to Paragraph B of this Article shall be made at least ninety days before the trial date or, if the evidence is intended solely to contradict or rebut evidence on the same subject matter identified by another party under Paragraph B of this Article, within thirty days after the disclosure made by the other party. The parties shall supplement these disclosures when required by Article 1428.

            D.(1) Except as otherwise provided in Paragraph E of this Article, a party may, through interrogatories, deposition, and a request for documents and tangible things, discover facts known or opinions held by any person who has been identified as an expert whose opinions may be presented at trial. If a report from the expert is required under Paragraph B, the deposition shall not be conducted until after the report is provided.

            (2) A party may, through interrogatories or by deposition, discover facts known by and opinions held by an expert who has been retained or specially employed by another party in anticipation of litigation or preparation for trial and who is not expected to be called as a witness at trial, only as provided in Article 1465 or upon a showing of exceptional circumstances under which it is impracticable for the party seeking discovery to obtain facts or opinions on the same subject by other means.

            (3) Unless manifest injustice would result, the court shall require that the party seeking discovery pay the expert a reasonable fee for time spent in responding to discovery under this Paragraph; and with respect to discovery obtained under Subparagraph (2) of this Paragraph, the court shall also require the party seeking discovery to pay the other party a fair portion of the fees and expenses reasonably incurred by the latter party in obtaining facts and opinions from the expert.

            E.(1) The expert's drafts of a report required under Paragraph B of this Article, and communications, including notes and electronically stored information or portions thereof that would reveal the mental impressions, opinions, or trial strategy of the attorney for the party who has retained the expert to testify, shall not be discoverable except, in either case, on a showing of exceptional circumstances under which it is impractical for the party seeking discovery to obtain facts or opinions on the same subject by other means.

            (2) Nothing in this Article shall preclude opposing counsel from obtaining any facts or data the expert is relying on in forming his opinion, including that coming from counsel, or from otherwise inquiring fully of an expert into what facts or data the expert considered, whether the expert considered alternative approaches, or into the validity of the expert's opinions.

            F.(1) A party seeking to challenge whether a witness qualifies as an expert or whether the methodologies employed by the witness are reliable under Code of Evidence Articles 702 through 705 shall file a motion for a pretrial hearing. The motion shall be filed not later than sixty days prior to trial and shall set forth sufficient allegations showing the necessity for these determinations by the court.

            (2) The court shall hold a contradictory hearing and shall rule on the motion not later than thirty days prior to the trial. At the hearing, the court shall consider the qualifications and methodologies of the proposed witness based upon the provisions of Code of Evidence Articles 104(A) and 702 through 705. For good cause shown, the court may allow live testimony at the contradictory hearing.

            (3) If the ruling of the court is made at the conclusion of the hearing, the court shall recite orally its findings of fact, conclusions of law, and reasons for judgment. If the matter is taken under advisement, the court shall render its ruling and provide written findings of fact, conclusions of law, and reasons for judgment not later than five days after the hearing.

            (4) The findings of facts, conclusions of law, and reasons for judgment shall be made part of the record of the proceedings. The findings of facts, conclusions of law, and reasons for judgment shall specifically include and address:

            (a) The elements required to be satisfied for a person to testify under Articles 702 through 705 of the Louisiana Code of Evidence.

            (b) The evidence presented at the hearing to satisfy the requirements of Articles 702 through 705 of the Louisiana Code of Evidence at trial.

            (c) A decision by the judge as to whether or not a person shall be allowed to testify under Articles 702 through 705 of the Louisiana Code of Evidence at trial.

            (d) The reasons of the judge detailing in law and fact why a person shall be allowed or disallowed to testify under Articles 702 through 705 of the Louisiana Code of Evidence.

            (5) A ruling of the court pursuant to a hearing held in accordance with the provisions of this Paragraph shall be subject to appellate review as provided by law.

            (6) Notwithstanding the time limitations in Subparagraphs (1), (2), and (3) of this Paragraph, by unanimous consent of the parties, and with approval by the court, a motion under this Paragraph may be filed, heard, and ruled upon by the court at any time prior to trial. The ruling by the court on such motion shall include findings of fact, conclusions of law, and reasons for judgment complying with the provisions of Subparagraph (4) of this Paragraph.

            (7) The provisions of this Paragraph shall not apply to testimony in an action for divorce or annulment of marriage, or to a separation in a covenant marriage, to a property partition, or to an administration of a succession, or to testimony in any incidental or ancillary proceedings or matters arising from such actions.

            (8) All or a portion of the court costs, including reasonable expert witness fees and costs, incurred when a motion is filed in accordance with this Paragraph may, in the discretion of the court, be assessed to the non-prevailing party as taxable costs at the conclusion of the hearing on the motion.

            Acts 1976, No. 574, §1; Acts 2003, No. 545, §1; Acts 2007, No. 140, §1; Acts 2008, No. 787, §1, eff. Jan. 1, 2009; Acts 2014, No. 655, §1; Acts 2024, No. 371, §1.

NOTE: See Acts 2008, No.787, §3 re: effectiveness of Act.