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Rule 143. Evidence

(a) General: Trials before the Court will be conducted in accordance with the rules of evidence applicable in trials without a jury in the United States District Court for the District of Columbia. See Code sec. 7453. To the extent applicable to such trials, those rules include the rules of evidence in the Federal Rules of Civil Procedure and any rules of evidence generally applicable in the Federal courts (including the United States District Court for the District of Columbia). Evidence which is relevant only to the issue of a party’s entitlement to reasonable litigation or administrative costs shall not be introduced during the trial of the case (other than a case commenced under Title XXVI of these Rules, relating to actions for administrative costs). As to claims for reasonable litigation or administrative costs and their disposition, see Rules 231 and 232. As to evidence in an action for administrative costs, see Rule 274 (and that Rule’s incorporation of the provisions of Rule 174 (b)).
(b) Ex Parte Statements: Ex parte affidavits, statements in briefs, and unadmitted allegations in pleadings do not constitute evidence. As to allegations in pleadings not denied, see Rules 36 (c) and 37 (c) and (d).
(c) Depositions: Testimony taken by deposition shall not be treated as evidence in a case until offered and received in evidence. Error in the transcript of a deposition may be corrected by agreement of the parties, or by the Court on proof it deems satisfactory to show an error exists and the correction to be made, subject to the requirements of Rules 81 (h)(1) and 85 (e). As to the use of a deposition, see Rule 81 (i).
(d) Documentary Evidence:
(1) Copies: A copy is admissible to the same extent as an original unless a genuine question is raised as to the authenticity of the original or in the circumstances it would be unfair to admit the copy in lieu of the original. Where the original is admitted in evidence, a clearly legible copy may be substituted later for the original or such part thereof as may be material or relevant, upon leave granted in the discretion of the Court.
(2) Return of Exhibits: Exhibits may be disposed of as the Court deems advisable. A party desiring the return at such party’s expense of any exhibit belonging to such party, shall, within 90 days after the decision of the case by the Court has become final, make written application to the Clerk, suggesting a practical manner of delivery. If such application is not timely made, the exhibits in the case will be destroyed.
(e) Interpreters: The parties ordinarily will be expected to make their own arrangements for obtaining and compensating interpreters. However, the Court may appoint an interpreter of its own selection and may fix the interpreter’s reasonable compensation, which compensation shall be paid by one or more of the parties or otherwise as the Court may direct.
(f) Expert Witness Reports:
(1) Unless otherwise permitted by the Court upon timely request, any party who calls an expert witness shall cause that witness to prepare a written report for submission to the Court and to the opposing party. The report shall set forth the qualifications of the expert witness and shall state the witness’s opinion and the facts or data on which that opinion is based. The report shall set forth in detail the reasons for the conclusion, and it will be marked as an exhibit, identified by the witness, and received in evidence as the direct testimony of the expert witness, unless the Court determines that the witness is not qualified as an expert. Additional direct testimony with respect to the report may be allowed to clarify or emphasize matters in the report, to cover matters arising after the preparation of the report, or otherwise at the discretion of the Court. After the case is calendared for trial or assigned to a Judge or Special Trial Judge, each party who calls any expert witness shall serve on each other party, and shall submit to the Court, not later than 30 days before the call of the trial calendar on which the case shall appear, a copy of all expert witness reports prepared pursuant to this subparagraph. An expert witness’s testimony will be excluded altogether for failure to comply with the provisions of this paragraph, unless the failure is shown to be due to good cause and unless the failure does not unduly prejudice the opposing party, such as by significantly impairing the opposing party’s ability to cross-examine the expert witness or by denying the opposing party the reasonable opportunity to obtain evidence in rebuttal to the expert witness’s testimony.
(2) The Court ordinarily will not grant a request to permit an expert witness to testify without a written report where the expert witness’s testimony is based on third-party contacts, comparable sales, statistical data, or other detailed, technical information. The Court may grant such a request, for example, where the expert witness testifies only with respect to industry practice or only in rebuttal to another expert witness.
(3) For circumstances under which the transcript of the deposition of an expert witness may serve as the written report required by subparagraph (1), see Rule 76 (e)(1).

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