Multidistrict litigation

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In United States law, multidistrict litigation (MDL) refers to a special federal legal procedure designed to speed the process of handling complex cases, such as air disaster litigation or complex product liability suits.


MDL cases occur when "civil actions involving one or more common questions of fact are pending in different districts."[1] In order to efficiently process cases that could involve hundreds (or thousands) of plaintiffs in dozens of different federal courts that all share common issues, the Judicial Panel on Multidistrict Litigation (JPML) decides whether cases should be consolidated under MDL, and if so, where the cases should be transferred. Cases subject to MDL are sent from one court, known as the transferor, to another, known as the transferee, for all pretrial proceedings and discovery. If a case is not settled or dismissed in the transferee court, it is remanded (that is, sent back) to the transferor court for trial.


The MDL statute is 28 U.S.C. § 1407 in the United States Code. Section 1407 came about because of the first large-scale complex litigation to engulf the federal judiciary: the gigantic antitrust scandal in the U.S. electrical equipment industry in the early 1960s.[2] The scandal resulted in the filing of 1,912 separate civil actions in district courts in 36 federal judicial districts, which together pleaded a total of 25,714 claims involving 20 product lines.[2] In January 1962, Chief Justice Earl Warren appointed a Co-ordinating Committee for Multiple Litigation of the United States District Courts.[2] (The Committee's name reflects the fact that it was still commonplace at the time to include a hyphen in the word "coordinate.") The chair of the Committee was Alfred P. Murrah, then the chief judge of the Tenth Circuit.[2] The Committee responded to the emergency with a number of ad hoc procedures which would become commonplace in multidistrict litigation, such as consolidated national depositions and document depositories.[2] Through aggressive case management, the Committee was able to terminate the electrical equipment litigation by March 1967; only nine cases went to trial and only five of those went to verdict.[2] In the course of its work, the Committee discovered that complex litigation involving similar issues in multiple districts was becoming a regularly recurring problem in federal courts, and recommended the enactment of a formal statutory foundation for their management in March 1964.[2] This eventually led to the enactment of the MDL statute four years later and the creation of the JPML as a permanent replacement for the Committee.[2]


In the decades since Congress enacted the MDL statute in 1968, MDLs have evolved into the federal judiciary's primary method for managing complex civil litigation. Once a small minority, MDLs have gradually become the dominant component of the U.S. federal civil caseload.[3] In early 2020, the JPML published statistical data revealing that by the end of 2018, 51.9 percent of all pending federal civil cases had been centralized into MDLs.[3] This was the first time that more than half of all federal civil cases had ended up in MDLs.[3] In particular, "of the 301,766 civil cases pending in the federal court system at the close of 2018, 156,511 were pending in 248 MDLs."[3] As percentages of the total number of MDLs, the top three categories were products liability (32.9%), antitrust (24.1%), and sales practices (12.1%).[3] In terms of the percentage of the total number of civil cases in MDLs, products liability was overwhelmingly dominant at 91 percent.[3]

In connection with MDLs' rise to prominence, they have become subject to widespread criticism from attorneys for both plaintiffs and defendants because they largely operate outside of the traditional civil procedure framework established by the Federal Rules of Civil Procedure (FRCP).[3] In other words, over half of American federal civil actions are no longer actually litigated under the rules taught in American law schools, as the MDL procedure has evolved from a "pretrial management tool toward an alternative dispute resolution medium setting the table for global settlements."[3]

Most MDLs involve a few dozen to a few hundred cases. The notable exception is MDL No. 875, based in the Eastern District of Pennsylvania, which is the largest and longest-lasting MDL. It was created in 1991 by the JPML to manage all asbestos personal injury and wrongful death cases in the federal courts. As of 2011, over 121,000 cases had been transferred into MDL No. 875, and over 108,000 cases had been settled, dismissed, or remanded, leaving about 13,000 pending.[citation needed]

One controversial aspect of MDLs is that the MDL statute does not grant the transferee court any discretion as to remand for trial, even when both courts would prefer to keep the case in the transferee court for trial. After all, by the time a case reaches the trial stage, the transferee has become intimately familiar with the issues, the parties, and their attorneys (because the transferee court will normally have decided one or more motions for summary judgment at that point), while the transferor court must spend time catching up on what happened while the case was away in the MDL. Therefore, the JPML promulgated a court rule authorizing the transferee to try a case before itself, if it wished. In 1998, however, the U.S. Supreme Court ruled that the plain language of the MDL statute required remand back to the transferor for trial, and invalidated the JPML's rule.[4] Congress has not yet amended the MDL statute to resolve this issue.[citation needed]

State law[edit]

When state law cases filed in federal court under diversity jurisdiction are consolidated into MDLs, the Erie doctrine comes into play and confronts federal district judges with some of the most difficult, multilayered legal questions they will ever see in their careers. The problem is that when sitting in diversity and asked to decide dispositive pretrial motions like the motion for summary judgment, the transferee court must apply the law of the state of the transferor court, which could be located anywhere in the United States.[5] But in complex product liability cases such as airplane crashes, the victims might not even be American citizens and the plaintiffs' losses may not even have occurred within the borders of the United States,[6] and of course, every U.S. state has its own choice-of-law rules. The result is that a MDL judge often has to sort through the laws of two, three, or four separate jurisdictions, none of which may be the state which the transferee court sits in, just to determine whether a plaintiff has a viable cause of action. Naturally, the lawyers in the proceeding must first educate themselves and the judge about the relevant laws from all those jurisdictions.

As of 2008, the District of Minnesota was the busiest district for MDL cases, with 9 active MDL cases pending as of December 2011.[7]


  1. ^ 28 U.S.C. § 1407
  2. ^ a b c d e f g h Peterson, Jr., Colvin A.; McDermott, John T. (August 1970). "Multidistrict Litigation: New Forms of Judicial Administration". ABA Journal. Chicago: American Bar Association. 56: 737–746.
  3. ^ a b c d e f g h Wittenberg, Daniel S. (February 19, 2020). "Multidistrict Litigation: Dominating the Federal Docket". Litigation News. American Bar Association.
  4. ^ Lexecon Inc. v. Milberg Weiss Bershad Hynes & Lerach, 523 U.S. 26 (1998).
  5. ^ Chang v. Baxter Healthcare Corp., 599 F.3d 728, 732 (7th Cir. 2010). The Seventh Circuit was reviewing a decision by a federal district court in Illinois as to whether the law of California or the law of Taiwan would control in a case consolidated into that court.
  6. ^ In re Paris Air Crash, 622 F.2d 1315 (9th Cir. 1980). This MDL arose from the crash of Turkish Airlines Flight 981 in France on a Orly to Heathrow flight; U.S. courts had jurisdiction because the plane was manufactured by McDonnell Douglas in Long Beach, California.
  7. ^ Pending MDL cases before the District Court for the District of Minnesota