Background
In federal legislation, regulations governing the "courts of the United States" only refer to the courts of the United States government, and not the courts of the individual states. Because of the federalist underpinnings of the division between federal and state governments, the various state court systems are free to operate in ways that vary widely from those of the federal government, and from one another. In practice, however, every state has adopted a division of its judiciary into at least two levels, and almost every state has three levels, with trial courts hearing cases which may be reviewed by appellate courts, and finally by a state supreme court. A few states have two separate supreme courts, with one having authority over civil matters and the other reviewing criminal cases. State courts may have different names and organization; trial courts may be called "courts of common plea" and appellate courts "superior courts" or "commonwealth courts. " State courts hear about 98% of litigation; most states have special jurisdiction courts, which typically handle minor disputes such as traffic citations, and general jurisdiction courts, which handle more serious disputes.
The U.S. federal court system hears cases involving litigants from two or more states, violations of federal laws, treaties, and the Constitution, admiralty, bankruptcy, and related issues. In practice, about 80% of the cases are civil and 20% are criminal. The civil cases often involve civil rights, patents, and Social Security while the criminal cases involve tax fraud, robbery, counterfeiting, and drug crimes. The trial courts are U.S. district courts, followed by United States courts of appeals and then the Supreme Court of the United States. The judicial system, whether state or federal, begins with a court of first instance, whose work may be reviewed by an appellate court, and then ends at the court of last resort, which may review the work of the lower courts.
Jurisdiction
Unlike some state courts, the power of federal courts to hear cases and controversies is strictly limited. Federal courts may not decide every case that happens to come before them. In order for a district court to entertain a lawsuit, Congress must first grant the court subject matter jurisdiction over the type of dispute in question. Though Congress may theoretically extend the federal courts' subject matter jurisdiction to the outer limits described in Article III of the Constitution, it has always chosen to give the courts a somewhat narrower power.
For most of these cases, the jurisdiction of the federal district courts is concurrent with that of the state courts. In other words, a plaintiff can choose to bring these cases in either a federal district court or a state court. Congress has established a procedure whereby a party, typically the defendant, can remove a case from state court to federal court, provided that the federal court also has original jurisdiction over the matter. Patent and copyright infringement disputes and prosecutions for federal crimes, the jurisdiction of the district courts is exclusive of that of the state courts.
US Court of Appeals and District Court Map
Courts of Appeals, with the exception of one, are divided into geographic regions known as circuits that hear appeals from district courts within the region..
Attorneys
In order to represent a party in a case in a district court, a person must be an Attorney At Law and generally must be admitted to the bar of that particular court. The United States usually does not have a separate bar examination for federal practice (except with respect to patent practice before the United States Patent and Trademark Office). Admission to the bar of a district court is generally granted as a matter of course to any attorney who is admitted to practice law in the state where the district court sits. Many district courts also allow an attorney who has been admitted and remains an active member in good standing of any state, territory or the District of Columbia bar to become a member. The attorney submits his application with a fee and takes the oath of admission. Local practice varies as to whether the oath is given in writing or in open court before a judge of the district.
Several district courts require attorneys seeking admission to their bars to take an additional bar examination on federal law, including the following: the Southern District of Ohio, the Northern District of Florida, and the District of Puerto Rico.
Appeals
Generally, a final ruling by a district court in either a civil or a criminal case can be appealed to the United States court of appeals in the federal judicial circuit in which the district court is located, except that some district court rulings involving patents and certain other specialized matters must be appealed instead to the United States Court of Appeals for the Federal Circuit, and in a very few cases the appeal may be taken directly to the United States Supreme Court.