Letters rogatory are formal requests from a court in one country asking a court in another country to perform a judicial act, such as taking testimony, producing documents, or serving process. They exist because no court’s authority reaches past its own borders, and they rest entirely on the foreign court’s willingness to help. If you need evidence or legal action from someone abroad and no treaty covers the situation, letters rogatory are usually the path. They are also slow, expensive, and discretionary, so understanding the alternatives matters as much as understanding the mechanism itself.
What They Are, and What They Are Not
Federal regulations define letters rogatory as a formal request from a court where an action is pending to a foreign court asking it to perform some judicial act. Typical examples include taking testimony, serving a summons or subpoena, or enforcing a civil judgment.1eCFR. 22 CFR 92.54 – Letters Rogatory Defined
They are not orders. A domestic subpoena carries the full force of the issuing court; ignore it and you face contempt. Letters rogatory carry no such power. They rest on comity, the mutual respect courts in different countries extend to one another, and they typically include a promise of reciprocity. The foreign court has full discretion over whether to grant the request.1eCFR. 22 CFR 92.54 – Letters Rogatory Defined
If the foreign court cooperates, it will use its own domestic tools to carry out the request, compelling a witness or ordering document production under its own law. If it declines, the requesting court has no recourse. Letters rogatory are, at bottom, a polite ask between sovereigns.
When You Actually Need Them
Letters rogatory come up when evidence, witnesses, or legal action are needed from people or entities outside the court’s jurisdiction. The common scenarios: a witness living abroad whose testimony is essential, documents held in a foreign country, or the need to serve process on a foreign party when no treaty mechanism applies. Federal Rule of Civil Procedure 28(b) lists a letter of request as one of four authorized methods for taking a deposition in a foreign country.2LII / Legal Information Institute. Federal Rules of Civil Procedure Rule 28 – Persons Before Whom Depositions May Be Taken
On the civil side, they appear in international commercial disputes, cross-border contract fights, and family law matters where a parent or assets are overseas. In criminal matters, prosecutors and defendants can both use them to obtain foreign evidence, though prosecutors generally prefer Mutual Legal Assistance Treaties when one is available.3Federal Judicial Center. Mutual Legal Assistance Treaties and Letters Rogatory
The practical reality: letters rogatory are the fallback you reach for when faster options don’t exist. If the foreign country participates in the Hague Evidence Convention, the Hague Service Convention, or an applicable Mutual Legal Assistance Treaty, those channels will almost always move faster and more predictably.
Faster Alternatives Worth Checking First
Before committing to a letter rogatory, check whether a treaty or statute gives you a shortcut.
The Hague Evidence Convention
The Hague Convention on the Taking of Evidence Abroad in Civil or Commercial Matters (1970) creates a streamlined system for obtaining evidence from signatory countries. Rather than routing requests through diplomatic channels, each participating country designates a Central Authority that receives and processes incoming requests directly. The United States is a party, as are most of Europe, Japan, China, Australia, and dozens of other nations.4United States Department of State. Judicial Assistance
The Convention covers only civil and commercial matters, not criminal cases. For member countries, requests typically complete in two to six months rather than a year or more.
Mutual Legal Assistance Treaties
In criminal matters, MLATs are the primary tool for obtaining foreign evidence. They are bilateral agreements that create binding obligations to cooperate, and unlike letters rogatory, MLAT requests can be used at the investigative stage before any indictment.3Federal Judicial Center. Mutual Legal Assistance Treaties and Letters Rogatory
The catch: MLATs are generally available only to government officials, typically prosecutors. Criminal defendants cannot use them except under rare provisions in treaties with a handful of countries. Defendants needing foreign evidence usually have to use letters rogatory.3Federal Judicial Center. Mutual Legal Assistance Treaties and Letters Rogatory
28 U.S.C. § 1782 Requests
This statute gives U.S. district courts power to order a person who resides or is found in the district to give testimony or produce documents for use in a proceeding before a foreign or international tribunal. The request can come from the foreign tribunal or from any interested person, including foreign litigants. The court can prescribe either U.S. procedures or the foreign country’s practices.5Office of the Law Revision Counsel. 28 USC 1782 – Assistance to Foreign and International Tribunals and to Litigants Before Such Tribunals
Section 1782 only reaches people and things inside the United States. For evidence held abroad, you still need letters rogatory, a treaty mechanism, or voluntary cooperation.
The Inter-American Convention on Letters Rogatory
For cases involving Western Hemisphere countries, the Inter-American Convention on Letters Rogatory and its Additional Protocol provide a framework for judicial cooperation. The United States interprets these agreements as limited to service of process, and both the Convention and Protocol must be in force between the countries involved. Members include Argentina, Brazil, Chile, Colombia, Ecuador, Mexico, Peru, and several others.6U.S. Department of State. Inter-American Service Convention and Additional Protocol
Preparing the Request
The requesting court drafts the letter, which must include enough information for the foreign court to understand what you want and why. At minimum, identify the requesting court, name all parties, summarize the dispute, and specify exactly what evidence or action is sought. For witness testimony, spell out the specific questions. For documents, describe them with enough precision that the foreign court can identify them.
Clarity carries more weight here than in most legal drafting. The reviewing court may have no familiarity with your legal system, and any ambiguity creates grounds for delay or refusal. The State Department advises that letters rogatory may be used to obtain evidence if permitted by the laws of the foreign country, so draft with the receiving country’s framework in mind.7U.S. Department of State. Preparation of Letters Rogatory
Translation Requirements
The letter rogatory, all interrogatories, and all supporting documents must be accompanied by a complete translation into the language of the country where the request will be executed. Letters rogatory coming the other way, from foreign courts into the United States, should include English translations unless circumstances make that unnecessary.8eCFR. 22 CFR Part 92 – Depositions and Letters Rogatory
Certified legal translation is not cheap. Rates run roughly $25 to $60 per page, and a complex request with exhibits can run dozens of pages. Budget for this up front; a request without proper translation will stall.
How the Request Gets to the Foreign Court
Under 28 U.S.C. § 1781, the Department of State has authority to receive a letter rogatory issued by a U.S. court, transmit it to the foreign tribunal, and receive and return it after execution. The same statute covers incoming requests from foreign courts to U.S. tribunals.9Office of the Law Revision Counsel. 28 USC 1781 – Transmittal of Letter Rogatory or Request
Diplomatic channels are the traditional route but not the only one. The statute explicitly does not preclude direct transmission between courts, and where a treaty designates Central Authorities (as the Hague Evidence Convention does), requests move through those authorities instead of the full diplomatic chain.9Office of the Law Revision Counsel. 28 USC 1781 – Transmittal of Letter Rogatory or Request
The practical difference is enormous. Diplomatic transmission takes the request through the State Department, the U.S. Embassy, the foreign ministry, and then down to the appropriate foreign court. Every handoff adds weeks. Central Authority transmission skips most of that chain.
What the Foreign Court Does With It
Once a foreign court agrees to execute the request, it does so under its own national laws and procedures, not those of the requesting country. For witness testimony, it compels the witness under its own subpoena power. For documents, it orders production under its own discovery rules. The State Department notes that many foreign courts do not permit foreign attorneys to participate in their proceedings, which can be a significant limitation if you hoped to cross-examine a witness yourself.7U.S. Department of State. Preparation of Letters Rogatory
This is where the process frustrates litigants accustomed to broad U.S. discovery. Many countries have far narrower rules about what evidence a court can compel, and sweeping document requests that would be routine in U.S. litigation may be treated as fishing expeditions abroad. Tailoring the request to what the foreign system will realistically grant works better than submitting an ambitious request that gets rejected or cut back.
Why a Foreign Court Might Refuse
A foreign court is never required to grant a letter rogatory. Knowing the common grounds for refusal in advance helps you avoid drafting a request that invites one.
Under the Hague Evidence Convention, a country may refuse to execute a letter of request only if execution does not fall within the functions of its judiciary, or if the country considers that its sovereignty or security would be prejudiced. A country cannot refuse solely because its own law claims exclusive jurisdiction over the subject matter or because its law would not recognize the underlying cause of action.10U.S. Department of Justice. Hague Convention on the Taking of Evidence Abroad in Civil or Commercial Matters
Outside the Hague framework, grounds for refusal are broader and less defined. Courts have rejected requests on public policy grounds, as fishing expeditions seeking evidence that would be inadmissible in the requested country, or as improper extensions of a foreign court’s jurisdiction. Requests touching on penal or regulatory enforcement are especially likely to meet resistance from countries that view the underlying proceedings as extraterritorial.
Data privacy laws add another layer. The European Union’s General Data Protection Regulation imposes strict requirements on transferring personal data outside the EU, and a letter rogatory seeking personal records held in an EU country can run into those restrictions, with the foreign court limiting or redacting what it provides.
What It Costs
The expenses add up across several categories, and most of them land on the party requesting the evidence.
- State Department processing fee: $2,275 for processing letters rogatory and related judicial assistance cases, including providing the seal and certificate for the return of executed letters rogatory.11eCFR. 22 CFR 22.1 – Schedule of Fees
- Translation: certified translation of all documents into the receiving country’s language, roughly $25 to $60 per page.
- Foreign execution costs: the receiving country’s court may charge its own fees for witness expenses, transcription, and related costs. When these are chargeable to a private party, that party must deposit an estimated amount with the Department of State or the appropriate Foreign Service post in advance.12eCFR. 22 CFR 92.70 – Special Fees for Depositions in Connection With Foreign Documents
- Attorney fees: your U.S. attorney to draft and shepherd the request, and often local counsel in the foreign jurisdiction, particularly where foreign lawyers cannot participate in court proceedings.
Total costs for a straightforward request can easily reach $5,000 to $10,000 before any foreign attorney fees. Complex requests involving multiple witnesses or extensive document production run considerably more.
How Long It Takes
Speed is not the hallmark of this process. The State Department warns that execution may take a year or more when requests travel through diplomatic channels.7U.S. Department of State. Preparation of Letters Rogatory The Foreign Affairs Manual estimates six months to a year for diplomatically transmitted requests.13U.S. Department of State. Foreign Affairs Manual – Compulsion of Evidence
Treaty-based channels move faster. Under the Hague Evidence Convention, most requests for oral testimony are completed within two to six months, and document requests follow a similar range. These are averages. Individual country responsiveness varies, and some judicial systems have backlogs that stretch timelines well beyond the norm.
If your domestic case has pending deadlines, raise the international evidence issue with the court early. Judges who understand the timeline realities are far more willing to grant extensions or adjust discovery schedules than judges confronted with a last-minute request for more time.