Rate of overturned decisions From 1999 to 2008, of the Ninth Circuit Court rulings that were accepted for review by the Supreme Court, 20% were affirmed, 19% were vacated, and 61% were reversed; the median reversal rate for all federal appellate courts was 68.29% for the same period. From 2010 to 2015, of the cases it accepted to review, the Supreme Court reversed around 79% of the cases from the Ninth Circuit, ranking its reversal rate third among the circuits; the median reversal rate for all federal circuits for the same time period was around 70 percent. Some argue the court's high percentage of reversals is illusory, resulting from the circuit hearing more cases than the other circuits. This results in the Supreme Court reviewing a smaller proportion of its cases, letting stand the vast majority of its cases. However, a detailed study in 2018 reported by
Brian T. Fitzpatrick, a law professor at
Vanderbilt University, looked at how often a federal circuit court was reversed for every thousand cases it terminated on the merits between 1994 and 2015. The study found that the Ninth Circuit's decisions were reversed at a rate of 2.50 cases per thousand, which was by far the highest rate in the country, with the Sixth Circuit second as 1.73 cases per thousand. such as "unwieldly size, procedural inefficiencies, jurisprudential unpredictability, and unusual
en banc process." Chief among these is the Ninth Circuit's unique rules concerning the composition of an
en banc court. In other circuits,
en banc courts are composed of all active circuit judges, plus (depending on the rules of the particular court) any senior judges who took part in the original panel decision. By contrast, in the Ninth Circuit it is impractical for 29 or more judges to take part in a single oral argument and deliberate on a decision en masse. The court thus provides for a limited
en banc review by the Chief Judge and a panel of 10 randomly selected judges. This means that
en banc reviews may not actually reflect the views of the majority of the court and indeed may not include any of the three judges involved in the decision being reviewed in the first place. The result, according to detractors, is a high risk of
intracircuit conflicts of law where different groupings of judges end up delivering contradictory opinions. That is said to cause uncertainty in the district courts and within the bar. However,
en banc review is a relatively rare occurrence in all circuits and Ninth Circuit rules provide for full
en banc review in limited circumstances. All recently proposed splits would leave at least one circuit with 21 judges, only two fewer than the 23 that the Ninth Circuit had when the limited
en banc procedure was first adopted. In other words, after a split at least one of the circuits would still be using limited
en banc courts. In March 2007, Associate Justices
Anthony Kennedy and
Clarence Thomas testified before a House Appropriations subcommittee that the consensus among the justices of the
Supreme Court of the United States was that the Ninth Circuit was too large and unwieldy and should be split. Congressional officials, legislative commissions, and interest groups have all submitted proposals to divide the Ninth Circuit such as: • Ninth Circuit Court of Appeals Reorganization Act of 1993, H.R. 3654 • Final Report of the Commission on Structural Alternatives for the Federal Courts of Appeals • Ninth Circuit Court of Appeals of Reorganization Act of 2003, S. 562 • Ninth Circuit Court of Appeals Judgeship and Reorganization Act of 2003, H.R. 2723 • Ninth Circuit Judgeship and Reorganization Act of 2004, S. 878 (reintroduced as the Ninth Circuit Judgeship and Reorganization Act of 2005, H.R. 211, and co-sponsored by House Majority Leader Tom DeLay) • Circuit Court of Appeals Restructuring and Modernization Act of 2005, S. 1845 • Circuit Court of Appeals Restructuring and Modernization Act of 2007, S. 525 • Ninth Circuit Court of Appeals Judgeship and Reorganization Act of 2017, H.R. 196 The more recent proposals have aimed to redefine the Ninth Circuit to cover California, Hawaii, Guam, and the Northern Mariana Islands, and to create a new Twelfth Circuit to cover Alaska, Arizona, Idaho, Montana, Nevada, Oregon, and Washington. == Current composition of the court ==