Service of process is the procedural mechanism that satisfies the due-process requirement that a defendant or respondent be notified of a legal action and given an opportunity to respond. The documents served typically include a summons and a complaint (or equivalent originating process), and may also cover subpoenas, petitions, and writs. Without proper service, a court generally lacks personal jurisdiction over the defendant and any resulting judgment may be void or vacated.
Rules vary by jurisdiction. In the United States, Rule 4 of the Federal Rules of Civil Procedure governs service in federal civil cases, permitting personal delivery, leaving documents at the defendant's dwelling with a suitable person, or delivery to an authorized agent. Most U.S. states have analogous rules and additionally allow service by mail or, in limited circumstances, by publication. In England and Wales, service is governed by Part 6 of the Civil Procedure Rules.
For cross-border litigation, the principal instrument is the Hague Convention on the Service Abroad of Judicial and Extrajudicial Documents in Civil or Commercial Matters (concluded 15 November 1965), which establishes Central Authorities in each contracting state to transmit and execute service requests. Within the European Union, the Service Regulation (Regulation (EU) 2020/1784, replacing Regulation 1393/2007) streamlines service between Member States.
Service on foreign states is subject to special regimes, such as 28 U.S.C. § 1608 in the United States, which requires service through diplomatic channels or in accordance with applicable treaties, and parallel provisions in the UK State Immunity Act 1978.
Common methods include:
- Personal service by a process server, marshal, or sheriff
- Substituted service on a household member or agent
- Service by mail, often requiring a return receipt or acknowledgment
- Service by publication when a defendant cannot be located, typically requiring court authorization
- Electronic service, increasingly permitted by court order
Defects in service are a frequent basis for motions to dismiss or to set aside default judgments.
Example
In 2020, a U.S. federal judge authorized WikiLeaks founder Julian Assange's legal team to be served via alternative means after traditional service proved impracticable, illustrating courts' willingness to permit substituted methods when defendants are difficult to reach.
Frequently asked questions
The court typically cannot exercise personal jurisdiction, and any judgment entered may be vacated or treated as void. The plaintiff usually must re-serve correctly, sometimes after seeking an extension of time.
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