By Jorge Schmidt, Legal Schmidt PLLC · Published June 28, 2026
Section 1782 lets a litigant in a foreign proceeding obtain discovery from a person found in the United States. But the statute does not reach everything: it expressly shields material protected by "any legally applicable privilege." A recurring fight is whether that shield covers a privilege created by foreign law — and, if so, who must prove the foreign privilege and how much proof it takes. On the quantum of proof, the circuits now disagree.
Start with the statute's reach. In Intel Corp. v. Advanced Micro Devices, Inc., 542 U.S. 241 (2004), the Supreme Court observed that § 1782(a) "expressly shields privileged material." Lower courts have read that shield to cover not only domestic privileges but foreign ones — for example, a foreign right against self-incrimination. A US court cannot brush aside a privilege claim merely because it arises under another legal system. The harder question is evidentiary: what must a party show to establish that the foreign privilege exists and would actually bar the evidence?
The Second Circuit set a demanding bar in Euromepa S.A. v. R. Esmerian, Inc., 51 F.3d 1095 (2d Cir. 1995). A district court, it held, "should consider only authoritative proof that a foreign tribunal would reject evidence obtained with the aid of section 1782." That proof must be "embodied in a forum country's judicial, executive or legislative declarations that specifically address the use of evidence gathered under foreign procedures." Absent that kind of clear directive from the foreign sovereign, the court should be guided by the statute's purpose of providing assistance.
The reasoning was a distrust of expert testimony. The court called it "unwise" for judges to glean other nations' practices from "conflicting and, perhaps, biased interpretations of foreign law" — the familiar spectacle of dueling expert affidavits. It also counseled restraint in the remedy: rather than deny relief outright, a court should usually issue a "closely tailored discovery order." The Second Circuit reversed the district court's outright denial and remanded. Although Euromepa framed the standard around a foreign tribunal's receptivity to the evidence, several district courts have carried its "authoritative proof" requirement over to claims of foreign privilege.
The Fourth Circuit took up the question in In re Banco Mercantil del Norte, S.A. (Banorte) v. Cartograf USA, Inc., 126 F.4th 926 (4th Cir. 2025). Two points were straightforward. First, joining the Second, Third, and Fifth Circuits, the court held that the party asserting a foreign privilege bears the burden of establishing it. Second, it confirmed that § 1782(a)'s privilege shield extends to material protected by a foreign legal privilege.
On the decisive question, though, the court held back. It declined to adopt the Second and Fifth Circuits' "authoritative proof" standard. It allowed that requiring such strong proof "may well be prudent" to avoid "speculative forays into legal territories unfamiliar to federal judges," but it found the question unnecessary to decide: the district court had acted within its discretion either way. What sank the privilege claim was the quality of the evidence. The foreign-law opinion offered to support it was, in the court's words, "issued with limited information" and "by no means [] a definitive legal opinion." On that record, the district court did not abuse its discretion in finding the privilege unproven, and the Fourth Circuit affirmed the grant of the application and the denial of the motion to quash.
The burden is settled: the party claiming a foreign privilege must prove it. What divides the courts is the quantum. The Second Circuit's line demands authoritative proof — judicial, executive, or legislative declarations from the foreign state — and some district courts apply that bar to foreign-privilege claims. The Fourth Circuit pointedly reserved whether so demanding a showing is required, leaving district courts room to weigh other evidence so long as it is not speculative or thin. Until the question is resolved, the standard a litigant faces may depend on where the subpoena lands.
One feature of the statute makes the privilege fight even more lopsided. The "for use" threshold is low. As Banorte reiterated, an applicant need only show "a reasonable possibility that the evidence sought will be employed with some advantage or serve some use" in the foreign proceeding; it need not be "essential for victory." Because the applicant clears that bar easily, the contest often comes down to whether the privilege claim is strong enough to withhold the documents.
Part of what makes this area unsettled is that the "authoritative proof" rule was not born as a privilege test. Euromepa articulated it for the second Intel factor — the foreign tribunal's receptivity to US assistance — asking whether the foreign forum would reject evidence gathered under Section 1782. The open question is how far that demanding standard travels into a distinct inquiry: whether a foreign privilege bars the material in the first place. Some district courts have carried it across, treating a foreign-privilege defense like a receptivity defense and demanding the same official proof. The Fourth Circuit in Banorte treated the two as related but declined to lock the standard in for privilege.
The distinction is not academic, because it decides what evidence counts. "Authoritative proof" means a foreign statute, a binding ruling of the country's highest court, or an official executive or legislative declaration that specifically addresses whether evidence compelled through foreign procedures may be used. A retained expert's opinion — however eminent the author — is not that, particularly when it is hedged or, as in Banorte, "issued with limited information." Under the strict view, a privilege claim unsupported by an official directive fails and the documents are produced; under the more flexible view, a thorough and persuasive expert showing might carry the day. Same facts, opposite results, turning on the forum.
For the party asserting a foreign privilege, the lesson is to build a definitive, authoritative record. A hedged, "limited," or admittedly "not definitive" expert opinion will lose under any of these standards. Anchor the claim in the formal sources of foreign law — statutes, high-court rulings, official declarations — that speak specifically to whether evidence gathered through US procedures may be compelled or used. Engage foreign-law counsel early, and make the opinion comprehensive rather than provisional.
For the applicant seeking discovery, the strategy is the mirror image: attack the quantum and quality of the opponent's foreign-law proof. Where the opposition rests on a thin or non-committal expert opinion, say so, and argue that it fails even the more flexible standard some courts apply. In a circuit that has not embraced the "authoritative proof" rule, that argument is often enough; in one that has, the absence of an official directive may itself defeat the privilege. Either way, frame the dispute around the strength of the proof, not the mere existence of a foreign rule, and be ready with the narrow, tailored order the courts prefer to outright denial.
Foreign privilege under Section 1782 is a question of proof as much as of law, and the proof standard is still unsettled at the circuit level. For the full framework and strategy, see A Practical Guide to Bringing and Defending Section 1782 Applications.