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The Uniform Interstate Depositions and Discovery Act (UIDDA): history, drafting, how it works, state-by-state adoption status as of April 2026, and the three states still pending adoption (NH, MO, MA).
Before 2007, obtaining discovery from an out-of-state witness was one of the most consistently frustrating parts of American civil litigation. An attorney handling a case in California who needed records from a witness in Ohio had to navigate a patchwork of state statutes, obtain a commission from the California court, file a miscellaneous action in Ohio, often retain local Ohio counsel, and wait weeks for a hearing before an Ohio judge would issue an enforceable Ohio subpoena. The process was slow, expensive, and inconsistent from state to state. The Uniform Interstate Depositions and Discovery Act (UIDDA) was drafted to solve that problem. This guide walks through the UIDDA’s history, its mechanics, current adoption status as of April 2026, and what practitioners should know about the jurisdictions that have not yet adopted it.
Pre-UIDDA, interstate discovery followed one of two paths, both slow:
Either way, a simple request for bank records from a neighboring state could take 30 to 60 days and cost thousands in local-counsel fees before the witness even received a subpoena. For high-volume commercial litigators, this was a tax on every case with any out-of-state witness. For smaller firms and self-represented parties, it often meant abandoning otherwise good discovery because the cost exceeded the value.
The Uniform Law Commission (formally the National Conference of Commissioners on Uniform State Laws), founded in 1892, drafts model statutes for state adoption. The ULC identifies areas where state-by-state variation imposes unnecessary costs and produces a uniform text that states can adopt in whole or with minor modifications. Prior ULC successes include the Uniform Commercial Code, the Uniform Probate Code, and the Uniform Trust Code.
The UIDDA drafting committee convened in 2005 with the goal of replacing the interstate-discovery patchwork with a uniform clerk-ministerial pathway. The committee studied existing state practice, identified the common elements of effective interstate-discovery mechanisms, and produced a draft that minimized judicial involvement while preserving the discovery state’s substantive control over privilege and scope.
The final UIDDA was promulgated by the ULC in July 2007. The act’s core innovation was procedural: the discovery state’s clerk of court, upon receiving a foreign subpoena from the requesting party, issues an equivalent subpoena without judicial review. The clerk’s role is strictly ministerial — they check that the papers are in order and apply the clerk’s seal. Any substantive challenge by the witness is handled through a motion to quash filed in the discovery-state court, which remains the forum for privilege, scope, and burden objections.
The UIDDA filing process is straightforward:
Step 1. The trial court in State A issues a subpoena under State A’s rules. This is the "foreign subpoena" in UIDDA parlance.
Step 2. The requesting party or their counsel identifies the discovery-state county where the witness is located. UIDDA venues filing on the clerk of the court in the discovery state in the county where the witness resides, is employed, or regularly transacts business.
Step 3. The requesting party presents the foreign subpoena to the discovery-state clerk, along with a filing fee (typically $25–$75) and a proposed discovery-state subpoena incorporating the terms of the foreign subpoena.
Step 4. The clerk issues the discovery-state subpoena. The clerk does not review the subpoena for propriety, privilege, or scope — the clerk’s function is purely ministerial. Typical turnaround is 3 to 10 business days; faster with e-filing.
Step 5. The requesting party serves the discovery-state subpoena on the witness under the discovery state’s service rules, tendering any required witness fees at the time of service.
If the witness wants to contest the subpoena, they file a motion to quash or modify with the discovery-state court. That motion requires local counsel admitted in the discovery state and is resolved on the merits under the discovery state’s rules of privilege, scope, relevance, and undue burden.
The UIDDA has achieved near-universal adoption across the United States. The Uniform Law Commission maintains a publicly accessible legislative tracker for pending UIDDA bills, and as of April 2026, only three states and Puerto Rico have pending UIDDA legislation:
New Hampshire. H.B. 1489 was introduced by Representative Bob Lynn and passed the New Hampshire House in April 2026. The bill was referred to the Senate and had a hearing scheduled for April 21, 2026. Until enactment, New Hampshire continues to use the commission-based process under the older Uniform Foreign Depositions Law at RSA 517-A.
Missouri. Multiple UIDDA bills have been introduced across recent sessions. Pending as of April 2026: H.B. 3116 (Rep. Cameron Parker) reported out of committee with a 10-0 vote; H.B. 1711 (Rep. Rudy Veit); S.B. 1180 and S.B. 1386 (both Sen. Curtis Trent). Missouri continues to use the commission-based process under Missouri Supreme Court Rule 57.03 for foreign subpoenas.
Massachusetts. H.5056 was reported favorably by the Judiciary Committee in February 2026 and referred to House Ways and Means. Companion bills H.1765, H.1857, H.1646, and S.D. 2673 remain in committee. Massachusetts continues to use G.L. c. 233 and Massachusetts Superior Court commission procedures for foreign subpoenas.
Puerto Rico. P.S. 0765 passed its original chamber in January 2026 and is in committee.
The most recent state to adopt UIDDA was Texas, via Texas Rule of Civil Procedure 201.3, effective August 31, 2025. The Texas Supreme Court finalized the rule following a public comment period that closed August 1, 2025. Texas had previously been one of the longest-holdouts among large states; its adoption brings UIDDA coverage to every major commercial-litigation jurisdiction in the United States.
A handful of states adopted the substance of the UIDDA by court rule rather than by stand-alone statute. These states are functionally UIDDA jurisdictions but require practitioners to cite the correct authority when briefing motions:
Montana adopted UIDDA at Mont. R. Civ. P. 28(c), effective October 1, 2011, with parallel codification at Mont. Code Ann. § 25-20-28(c). Cite the rule when briefing.
Wyoming uses W.R.C.P. 28(c) as a rule-based UIDDA-equivalent, with the older Uniform Foreign Depositions Law at Wyo. Stat. Ann. § 1-12-115 remaining on the books. Some authoritative sources treat Wyoming as a UIDDA state on the strength of W.R.C.P. 28(c); others flag ambiguity because the state never enacted a statutory UIDDA. Wyoming does not appear on the Uniform Law Commission’s pending-UIDDA tracker, which supports the rule-based interpretation. Practical guidance: out-of-state counsel should verify current procedure directly with the Wyoming district court clerk before filing.
Older secondary sources occasionally list additional states as non-adopters based on information from 2010–2015 that is no longer current. Mississippi adopted UIDDA at Miss. Code Ann. § 11-59-1 et seq., effective July 1, 2011 — it is an adopter, despite some older articles still treating it as a hold-out. Similarly, Florida adopted UIDDA at Fla. Stat. § 92.251, effective July 1, 2019, and Pennsylvania adopted UIDDA at 42 Pa. C.S. § 5331 et seq. Always verify current status with the ULC tracker before relying on legacy references.
UIDDA is purely procedural. It changes how an interstate subpoena gets into the discovery court, not what the subpoena can accomplish once it’s there. Several important things UIDDA does not address:
Discovery scope and privilege. The discovery state’s rules on privilege, relevance, scope, undue burden, and proportionality control any objection. A subpoena overbroad under the discovery state’s standards will be quashed even if it would be permissible under the trial state’s standards. A communication privileged under the discovery state’s law cannot be compelled even if the trial state recognizes no such privilege.
Witness fees. The discovery state’s witness-fee statute applies to subpoenas domesticated under UIDDA. Federal Rule 45’s $40/day standard does not apply to state-court subpoenas. Rates vary from about $10/day in some Southern states to $40/day in New York and California, often with mileage provisions.
Service of the domestic subpoena. The discovery state’s rules on service of subpoenas apply. If the discovery state requires personal service, a mailed subpoena is defective regardless of the trial state’s rules.
Motion practice. Motions to quash, modify, or compel require local counsel admitted in the discovery state. UIDDA gets the subpoena issued; it does not eliminate local counsel when the subpoena is contested.
Cross-jurisdictional protective orders. A protective order issued by the trial court is not automatically enforceable in the discovery state. Confidentiality should be addressed on the front end through incorporation into the foreign subpoena or a parallel discovery-state protective order.
For a typical cooperative-witness scenario in a UIDDA state, the practitioner workflow is:
Day 1. Issue the foreign subpoena in the trial state. Send notice to all parties per trial-state rules (Fed. R. Civ. P. 45(a)(4) requires 7-day notice for federal document subpoenas; state rules vary).
Day 2–3. Prepare the domestication packet. Verify the witness’s county through current credit-header or public-record data, draft the proposed discovery-state subpoena, and confirm the discovery state’s filing fee and local practice.
Day 4–14. File with the discovery-state clerk. Clerks typically issue the domesticated subpoena within 3 to 10 business days, faster with e-filing.
Day 14–18. Serve the domesticated subpoena on the witness under the discovery state’s service rules, tendering required witness fees at service.
For non-UIDDA states (New Hampshire, Missouri, Massachusetts as of April 2026), add 30 to 60 days to the timeline for the commission motion, local-counsel engagement, and miscellaneous action. Total cost typically runs $2,000 to $5,000 for the non-UIDDA process versus $250 to $550 for a standard UIDDA filing.
The UIDDA’s practical impact has been substantial. Interstate discovery that would have taken six weeks and $3,000 in 2005 now typically takes two weeks and $400. For commercial litigation with multiple out-of-state witnesses, the aggregate savings are significant. For self-represented parties and small-firm practitioners, the Act has made interstate discovery meaningfully more accessible.
The uniformity UIDDA introduced also reduced the risk of procedural error. Pre-UIDDA, each state had its own quirks and local conventions; an attorney familiar with California’s process could still stumble in Oregon. Post-UIDDA, the process is substantively identical across adopting jurisdictions, which lowers the cost of occasional multi-state practice.
The one ongoing challenge is the non-UIDDA states. Until New Hampshire, Missouri, and Massachusetts complete adoption, interstate practitioners must maintain competency in two distinct domestication procedures and budget accordingly for work in those jurisdictions. H.B. 1489 in New Hampshire and the various Missouri and Massachusetts bills suggest adoption in those states is imminent; the 2026 and 2027 legislative sessions are likely to bring the remaining holdouts into line.
Served 123 LLC handles UIDDA domestication nationwide, with specialized workflow for the three remaining non-adopter states. For UIDDA jurisdictions, we prepare the domestication packet, verify the correct filing county through current address data, file with the discovery-state clerk, track the clerk’s issuance of the domesticated subpoena, and serve the witness under the discovery state’s service rules — all typically within 2 to 3 weeks of receiving the original subpoena from the client.
For New Hampshire, Missouri, and Massachusetts, we coordinate with local counsel for the commission-based miscellaneous action, handle the service of the resulting subpoena, and deliver a complete documentation package at completion. For Wyoming’s W.R.C.P. 28(c) rule-based approach, we verify current procedure with the specific Wyoming district court before filing to confirm whether clerk-ministerial issuance is available or a commission-based approach is required.
The Uniform Interstate Depositions and Discovery Act, finalized by the Uniform Law Commission in 2007. It standardizes interstate subpoena enforcement by converting the process from a judicial act requiring a commission into a clerk-ministerial act.
As of April 2026, three state non-adopters have pending UIDDA legislation: New Hampshire (H.B. 1489), Missouri (multiple bills), and Massachusetts (H.5056 and companions). Puerto Rico also has pending legislation. Every other U.S. state and the District of Columbia has adopted UIDDA.
Texas adopted UIDDA via Texas Rule of Civil Procedure 201.3, effective August 31, 2025. The Texas Supreme Court finalized the rule after a public comment period that closed August 1, 2025.
Mississippi adopted UIDDA at Miss. Code Ann. § 11-59-1 et seq., effective July 1, 2011. Despite some older articles still listing Mississippi as a non-adopter, it has been a UIDDA state since 2011.
Wyoming uses W.R.C.P. 28(c) as a rule-based UIDDA-equivalent, with the older Uniform Foreign Depositions Law at Wyo. Stat. Ann. § 1-12-115 remaining on the books. Wyoming does not appear on the Uniform Law Commission's current pending-UIDDA tracker. Practitioners should verify current procedure with the specific Wyoming district court before filing.
Only for the clerk-ministerial filing itself. Local counsel is still required for any contested motion practice (motions to quash, compel, or modify) and for contempt enforcement against a non-complying witness.
Letters rogatory are a formal diplomatic-style request from one court to another, historically used primarily for international discovery. UIDDA is a streamlined state-to-state domestic procedure that eliminates the judicial step between courts. Letters rogatory remain relevant for discovery in foreign countries.
Served 123 LLC handles UIDDA domestication in every adopting U.S. jurisdiction and coordinates commission-based workflow with local counsel in New Hampshire, Missouri, and Massachusetts. We prepare the packet, file with the correct county clerk, secure the domestic subpoena, and serve the witness — typically within 2-3 weeks in UIDDA states.
