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Federal Rules of Evidence
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Federal Rule of Evidence 615 governs witness sequestration in federal court and does not automatically exempt expert witnesses from exclusion. This article explains when an expert may remain in the courtroom under Rule 615(a)(3), how sequestration interacts with Rule 703 and fact-expert testimony, what changed in the 2023 amendment, and what attorneys should consider when addressing access to testimony and potential violations of a sequestration order.
In federal proceedings governed by the Federal Rules of Evidence, Rule 615 generally requires the court to exclude witnesses at a party's request and also permits the court to order exclusion on its own. Expert witnesses are not automatically exempt, so a party seeking to keep an expert in the courtroom may need to show under Rule 615(a)(3) that the expert's presence is essential to presenting the claim or defense.
Rule 615 does not authorize the exclusion of four categories of people: a natural-person party; one officer or employee of a non-natural-person party designated by its attorney as the party's representative; a person whose presence a party shows to be essential to presenting a claim or defense; and a person authorized by statute to be present. For an expert who does not fall within another exception, Rule 615(a)(3) may apply if the party shows that the expert's presence is essential to presenting its claim or defense.
This guide explains when an expert may remain in the courtroom, how Rule 703 interacts with sequestration, and what changed under Rule 615 in 2023.
Witness sequestration is intended to reduce the risk that a witness will shape testimony after hearing another witness. It can also help expose fabrication, inaccuracy, or collusion.
The analysis can differ for experts. An expert may need to hear testimony that affects the assumptions underlying an opinion, but expert status alone does not create a blanket exemption. Sequestration may also raise different concerns when the expert has firsthand knowledge of the disputed events.
A party relying on Rule 615(a)(3) must show that the expert's presence is essential to presenting the claim or defense, such as by explaining why the expert needs to hear particular testimony or advise counsel during the proceeding.
In Opus 3 Limited v. Heritage Park, Incorporated, 91 F.3d 625 (4th Cir. 1996), the Fourth Circuit upheld the sequestration of a proposed expert who was also a key fact witness. The court explained that, even if he were testifying only as an expert, the party had not shown that he needed to hear the other witnesses' testimony to render his opinions.
The Seventh Circuit reached a similar conclusion in United States v. Olofson, 563 F.3d 652 (7th Cir. 2009), where much of the relevant information was already available through pretrial disclosures and information that emerged at trial could be addressed during the expert's direct examination.
An expert's presence may therefore be helpful without being essential under Rule 615(a)(3).
In federal proceedings governed by the Federal Rules of Evidence, Rule 615 generally requires the court to exclude witnesses at a party's request and also permits the court to order exclusion on its own. Expert witnesses are not automatically exempt, so a party seeking to keep an expert in the courtroom may need to show under Rule 615(a)(3) that the expert's presence is essential to presenting the claim or defense.
Rule 615 does not authorize the exclusion of four categories of people: a natural-person party; one officer or employee of a non-natural-person party designated by its attorney as the party's representative; a person whose presence a party shows to be essential to presenting a claim or defense; and a person authorized by statute to be present. For an expert who does not fall within another exception, Rule 615(a)(3) may apply if the party shows that the expert's presence is essential to presenting its claim or defense.
This guide explains when an expert may remain in the courtroom, how Rule 703 interacts with sequestration, and what changed under Rule 615 in 2023.
Witness sequestration is intended to reduce the risk that a witness will shape testimony after hearing another witness. It can also help expose fabrication, inaccuracy, or collusion.
The analysis can differ for experts. An expert may need to hear testimony that affects the assumptions underlying an opinion, but expert status alone does not create a blanket exemption. Sequestration may also raise different concerns when the expert has firsthand knowledge of the disputed events.
A party relying on Rule 615(a)(3) must show that the expert's presence is essential to presenting the claim or defense, such as by explaining why the expert needs to hear particular testimony or advise counsel during the proceeding.
In Opus 3 Limited v. Heritage Park, Incorporated, 91 F.3d 625 (4th Cir. 1996), the Fourth Circuit upheld the sequestration of a proposed expert who was also a key fact witness. The court explained that, even if he were testifying only as an expert, the party had not shown that he needed to hear the other witnesses' testimony to render his opinions.
The Seventh Circuit reached a similar conclusion in United States v. Olofson, 563 F.3d 652 (7th Cir. 2009), where much of the relevant information was already available through pretrial disclosures and information that emerged at trial could be addressed during the expert's direct examination.
An expert's presence may therefore be helpful without being essential under Rule 615(a)(3).
Federal Rule of Evidence 703 allows an expert to base an opinion on facts or data the expert has been made aware of or personally observed. In Olofson, the Seventh Circuit held that Rule 703 does not automatically exempt an expert from a Rule 615 sequestration order.
If live testimony will supply or change assumptions underlying an opinion, counsel should explain why the expert needs to hear it firsthand. Rule 703 concerns the basis of the expert's opinion, while Rule 615 separately governs whether the expert may remain during another witness's testimony.
The amendment, which took effect on December 1, 2023, clarified that courtroom exclusion under Rule 615(a) is separate from restrictions on access to or disclosure of trial testimony under Rule 615(b). A witness excluded from the courtroom is not automatically barred from receiving or accessing that testimony. A Rule 615(a) exclusion order does not by itself restrict disclosure of or access to trial testimony. The court may impose those additional restrictions by order under Rule 615(b).
The amendment resolved disagreement over whether a general sequestration order extended to out-of-court access to testimony. The Committee Note also confirms that courtroom exclusion includes exclusion from a virtual trial.
The amendment also clarified that Rule 615(a)(2) protects only one designated officer or employee per entity from exclusion at a time. If an entity wants an additional witness-representative exempt from sequestration, it must establish under Rule 615(a)(3) that the person's presence is essential to presenting its claim or defense.
Counsel should therefore review the order carefully to determine whether it covers only courtroom exclusion or also restricts access to testimony.
An expert with firsthand knowledge of disputed events may present a different sequestration issue from an expert retained only to analyze evidence.
In Opus 3, the proposed expert in general contracting and project management was also a key fact witness concerning the disputed construction work. Counsel should therefore identify before trial whether an expert will provide only specialized analysis or also testify about events personally observed, decisions made, or work performed.
Counsel should determine what testimony the expert expects to rely on and whether the same information is already available through reports, depositions, records, testing, or other discovery. If live testimony is needed, the request should explain why the expert needs to hear it, how it would affect the expert's analysis, and why the expert's presence is essential to presenting the claim or defense.
The expert should also receive instructions that match the court's actual sequestration order, including any separate Rule 615(b) restrictions.
A violation of a sequestration order does not necessarily require exclusion of the witness's testimony. The appropriate response depends on the circumstances, the terms of the court's order, and applicable precedent.
In United States v. Robertson, 895 F.3d 1206 (9th Cir. 2018), a criminal case involving government agents rather than experts, two agents reviewed transcripts of a pretrial hearing before testifying at trial. Applying the pre-2023 version of Rule 615, the Ninth Circuit held that an exclusion order extended to a witness's review of transcripts from an earlier related proceeding, not only to hearing testimony in the courtroom. The district court had assumed a violation and permitted cross-examination about the agents' exposure to the transcripts, and the Ninth Circuit found no abuse of discretion, recognizing cross-examination as a suitable remedy where the violation was not deliberate.
Under the current rule, a Rule 615(a) order operates only to exclude witnesses from the courtroom, but the court may impose additional restrictions on disclosure of or access to trial testimony by order under Rule 615(b).
Other remedies or sanctions may also be available.
For an expert, a threshold question is whether the conduct actually violated the court's order, including any separate restrictions imposed under Rule 615(b).
Does Rule 615 apply to expert witnesses?
Yes. Experts are not categorically exempt from Rule 615. A party may seek an exception under Rule 615(a)(3) by showing that the expert's presence is essential to presenting the claim or defense.
Can an expert hear the opposing expert testify?
Possibly. If the court finds that the expert's presence is essential under Rule 615(a)(3), Rule 615 does not authorize the expert's exclusion. A general desire to hear and respond to the opposing expert, however, may not be enough to establish essentiality.
Can counsel tell an excluded expert what another witness said?
It depends on the court's order. A Rule 615(a) order by itself excludes witnesses only from the courtroom. Under Rule 615(b), the court may also prohibit disclosure of trial testimony to excluded witnesses or prohibit them from accessing it.
Does Rule 615 apply to depositions?
Not in federal civil depositions governed by Federal Rule of Civil Procedure 30(c)(1). The examination and cross-examination of a deponent generally proceed under the Federal Rules of Evidence except Rules 103 and 615. A party seeking to exclude someone may instead need to seek a protective order under Rule 26(c)(1)(E), which permits the court, for good cause, to designate who may be present while discovery is conducted, or rely on another applicable basis.
Federal Rule of Evidence 703 allows an expert to base an opinion on facts or data the expert has been made aware of or personally observed. In Olofson, the Seventh Circuit held that Rule 703 does not automatically exempt an expert from a Rule 615 sequestration order.
If live testimony will supply or change assumptions underlying an opinion, counsel should explain why the expert needs to hear it firsthand. Rule 703 concerns the basis of the expert's opinion, while Rule 615 separately governs whether the expert may remain during another witness's testimony.
The amendment, which took effect on December 1, 2023, clarified that courtroom exclusion under Rule 615(a) is separate from restrictions on access to or disclosure of trial testimony under Rule 615(b). A witness excluded from the courtroom is not automatically barred from receiving or accessing that testimony. A Rule 615(a) exclusion order does not by itself restrict disclosure of or access to trial testimony. The court may impose those additional restrictions by order under Rule 615(b).
The amendment resolved disagreement over whether a general sequestration order extended to out-of-court access to testimony. The Committee Note also confirms that courtroom exclusion includes exclusion from a virtual trial.
The amendment also clarified that Rule 615(a)(2) protects only one designated officer or employee per entity from exclusion at a time. If an entity wants an additional witness-representative exempt from sequestration, it must establish under Rule 615(a)(3) that the person's presence is essential to presenting its claim or defense.
Counsel should therefore review the order carefully to determine whether it covers only courtroom exclusion or also restricts access to testimony.
An expert with firsthand knowledge of disputed events may present a different sequestration issue from an expert retained only to analyze evidence.
In Opus 3, the proposed expert in general contracting and project management was also a key fact witness concerning the disputed construction work. Counsel should therefore identify before trial whether an expert will provide only specialized analysis or also testify about events personally observed, decisions made, or work performed.
Counsel should determine what testimony the expert expects to rely on and whether the same information is already available through reports, depositions, records, testing, or other discovery. If live testimony is needed, the request should explain why the expert needs to hear it, how it would affect the expert's analysis, and why the expert's presence is essential to presenting the claim or defense.
The expert should also receive instructions that match the court's actual sequestration order, including any separate Rule 615(b) restrictions.
A violation of a sequestration order does not necessarily require exclusion of the witness's testimony. The appropriate response depends on the circumstances, the terms of the court's order, and applicable precedent.
In United States v. Robertson, 895 F.3d 1206 (9th Cir. 2018), a criminal case involving government agents rather than experts, two agents reviewed transcripts of a pretrial hearing before testifying at trial. Applying the pre-2023 version of Rule 615, the Ninth Circuit held that an exclusion order extended to a witness's review of transcripts from an earlier related proceeding, not only to hearing testimony in the courtroom. The district court had assumed a violation and permitted cross-examination about the agents' exposure to the transcripts, and the Ninth Circuit found no abuse of discretion, recognizing cross-examination as a suitable remedy where the violation was not deliberate.
Under the current rule, a Rule 615(a) order operates only to exclude witnesses from the courtroom, but the court may impose additional restrictions on disclosure of or access to trial testimony by order under Rule 615(b).
Other remedies or sanctions may also be available.
For an expert, a threshold question is whether the conduct actually violated the court's order, including any separate restrictions imposed under Rule 615(b).
Does Rule 615 apply to expert witnesses?
Yes. Experts are not categorically exempt from Rule 615. A party may seek an exception under Rule 615(a)(3) by showing that the expert's presence is essential to presenting the claim or defense.
Can an expert hear the opposing expert testify?
Possibly. If the court finds that the expert's presence is essential under Rule 615(a)(3), Rule 615 does not authorize the expert's exclusion. A general desire to hear and respond to the opposing expert, however, may not be enough to establish essentiality.
Can counsel tell an excluded expert what another witness said?
It depends on the court's order. A Rule 615(a) order by itself excludes witnesses only from the courtroom. Under Rule 615(b), the court may also prohibit disclosure of trial testimony to excluded witnesses or prohibit them from accessing it.
Does Rule 615 apply to depositions?
Not in federal civil depositions governed by Federal Rule of Civil Procedure 30(c)(1). The examination and cross-examination of a deponent generally proceed under the Federal Rules of Evidence except Rules 103 and 615. A party seeking to exclude someone may instead need to seek a protective order under Rule 26(c)(1)(E), which permits the court, for good cause, to designate who may be present while discovery is conducted, or rely on another applicable basis.
Federal Rules of Evidence
Federal Rules of Evidence