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Introduction to Legal Research


Case Law and Its Authority

Case law is the collection of reported cases that form the body of law withing a given jurisdiction.  It is based upon judicial opinions by various courts, which may set future precedent.

Courts in the United States adhere to stare decisis, which generally means that courts respect and adhere to the precedent of previous decisions.  However, a court does not have to stand by a decision that is not binding precedent.  Generally courts will follow the decisions of higher courts in their jurisdiction.  Therefore the effect of a court's decision on other courts will depend both on the level of the court and its jurisdiction.  A decision by the United States Supreme Court is binding precedent in all courts. 

A decision by the United States Court of Appeals for the 11th Circuit would not be binding on the United States Supreme Court or courts from another circuit.  However, it would be binding in all lower courts of the 11th Circuit.

Publication of Case Law

Not all case law is published.  Generally, appellate court decisions that will be used as future precedent are published (reported) in sources (case reporters) specific to that court.  Attorneys use published case law as a means to interpret the law.  For these reasons, few trial court decisions are published in case reporters.

The Judicial Process

A case starts at the trial court level, which could either be a trial by judge or trial by jury.  Generally, evidence and witnesses are presented at the trial court level.

An appellate court will hear appeals from parties seeking to change the result of the case heard at the trial court.  An appellate court will not answer questions of fact, meaning they will not review the evidence in a case.  Instead, the appellate court rules on questions of law, which means it considers legal issues.  

Because of the parallel system between state courts and federal courts, researching case law can be difficult and complex.  A researcher will often need to determine if their issue is one that is inherently federal or state.  Even then, some issues can overlap each other and require a state and federal analysis. 


Federal Court System

The federal court system is made up of the following courts, excluding the specialized courts: 

Court Description
The Supreme Court of the United States Most of the cases heard are appeals from lower courts and cases from state supreme courts which involve a point of federal law. The court has discretion to decide which cases it will consider.
The United States Court of Appeals  Made up of appellate courts which deal with appeals from the district courts in their circuit.  There are 11 circuit court of appeals, plus 1 federal circuit court of appeals.  
United States District Courts Trial courts which deal with violations of federal criminal law, disputes regarding federal laws or treaties, and some cases involving residents of different states.


The following link provides a map and additional information on the 11 circuits, the federal circuit, and the Supreme Court.

Finding a Case

A researcher will not always have a case citation when they begin their research.  Often times a researcher will have an issue or topic that are looking for case law on.  Without a case citation, a researcher would have a daunting challenge trying to go straight to a case reporter and locate a case on their topic.  However, there are several avenues that a researcher can go down if they do not have a citation for a case.

Here are a few suggestions when looking for case law without a citation:

  1. Annotated Codes (statutes): annotated codes such as the United States Code Annotated (West) or the United States Code Service (LexisNexis) provide researchers with citations to case law. 
  2. Digests: provide an indexing function for cases in the National Reporter system.  
  3. Legal Encylopedias: cover a wide range of topics that are arranged alphabetically.  Many of the topics include footnotes with citations to relevant case law.     
  4. LexisNexis Academic: research system that allows users to search for cases by party name, case citation, or by keyword searches. 

Each of these methods are described in more detail in the boxes that follow.

Finding a Case: Annotated Codes

Annotated codes produced by West and LexisNexis are a great way to find cases on a particular topic.  As mentioned on the Legislative tab, not every law is statutory law, therefore this would not be a good place to find cases where the underlying law is not rooted in statutory law.  However, for issues that do invoke statutory law, the annotated codes are an efficient way to find cases that have cited that particular statute.

Both the United States Code Annotated and the United States Code Service provide case citations after the text of the statute.  The cases will be grouped together by topic and they will often include a short summary.  This provides the researcher with an easier method of locating case law that deals with their particular issue.

For more information on finding a statute in an annotated code, please refer back to the Legislative tab.  

Finding a Case: Digests

West's Digests provide an indexing function for the cases in the National Reporter System.  The digests allow researchers to locate cases by subject from any jurisdiction.  In addition, the digests provide an abstracting function, giving researchers short summaries of the points of law discussed in the indexed opinions.  This enables researchers to determine if a case would be worth further exploring without having to read the entire case.   

The Digest System sub-divides the law into over 450 Topics, which are broad legal issues, and then further sub-divided into Key Numbers, which are assigned to specific legal issues within the broader issue.  Topics and Key Numbers are consistent throughout West's System - the same subject arrangement is applied to all cases from every jurisdiction, so that if you find a case from one jurisdiction that discusses a legal issue you are researching, you can use the topic and key number for that isssue to find other cases from other jurisdictions that discuss the same issue.  Remember that you need to know both the topic AND the key number to search the digests.

Currently, the GSU College of Law Library has West's Federal Practice Digest in its collection.  There are two ways that one can search the federal practice digest:

  1. Table of Cases:  The table of cases lists all of the cases indexed in the digest in alphabetical order.  In addition to the case name and citation, the table of cases also provides the Topics and Key Numbers that apply to that particular case.  This is a great way for a researcher to find the citation for their case if they have the name of the case.  Additionally, this is also a great way to see all of the Topics and Key Numbers that apply to a particular case.  This may lead to futher investigation of those Topics and Key Numbers, which could produce additional cases on the issue for the researcher.

  2. Desciptive Word Index: The descriptive word index allows researchers to search by topics and subtopics.  A researcher may start with a broad topic and then narrow down the topic to a subtopic.  A subtopic will either provide the appropriate Topic and Key Number where one can find that topic, or it will refer the researcher to another topic.  The index also includes a table at the beginning which lists the topics in order and their abbreviations used in the index.


Here is the typical process of using the descriptive word index to find a case along with an example: 

  • A user who is doing research on "abduction" would first go to the Descriptive Word Index. The index is usually several volumes of the digest, generally located near the end of the set of books. Looking under "abduction," one would find several subtopics. If one was only concerned with the criminal liability involved in abduction, they they would look at "CRIMINAL liability" under the term "ABDUCTION." Criminal liability provides the user with the Topic and Key Number Crim Law 45.10.
  • The front of each index provides the researcher with a list of digest topics and what the abbreviations mean.  In the case of our example, Crim Law would mean topic Criminal Law.  Topics are in order alphabetically in the digest.  Therefore, to locate Criminal Law, one would need to just look on the spine of the book until the come to the appropriate volume.  
  • Once at the appropriate volume and topic, the researcher can flip to Key Number 45.10.  Key numbers will be in chronological order in each topic.  Once at the correct key number, the researcher will see lists of cases with ciatations and short summaries of those cases.  If the case appears to be on point with what the researcher is looking for, then they can take down the case citation and retrieve that case from the appropriate reporter.



Find a Case: Legal Encyclopedias

Legal encyclopedias are another great way to find case citations on topics.  Generally, a legal encyclopedia is arranged alphabetically by topic, which are further divded into more detailed subtopics.  Legal encyclopedias provide broad coverage of American state and federal law, including excerpts from judicial decisions and statutes.

For researching federal law, the two most popluar legal encyclopedias are American Jurisprudence (AmJur) and Corpus Juris Secundum (CJS).  Both of these publications provide researchers with a summary of the state of the law along with references to West's Topic and Key Numbers. 

Methods for Searching

Researchers can search for their issue in AmJur and CJS using the General Index.  Similiar to other indexes, the General Index is organized alphabetically by topic, with each topic divided into subtopics.  Citations are provided in Topic and Section format.  An abbreviations table is provided at the front of each volume of the general index to aid researchers in identifying topic names in the index.  Similiar to digets, once a researcher has the topic name and section number for their specific subtopic, they can browse the spine of the books and look for the topic name.  Once at the correct topic name, they can then look for the appropriate section number.  Sections are listed in chronological order. 

In addition to the General Index, AmJur also includes a volume entitled "Table of Laws and Rules."  This volume has several tables which provide cross references from United States Code Annotated sections and Code of Federal Regulations sections to topics and sections in AmJur.  This enables researchers to find articles citing those particular laws and regulations, which could lead to further case citations. 

Additional Places to Access Federal Case Law

Printed Reporters and LexisNexis Academic are not the only places researchers can access case law.  Many websites are devoted to providing free access to case law.  Although not comprehensive, many of these websites do offer a good amount of case law if someone knows what they are looking for.  

Case Reporters


Cases are published in chronological order in books called reporters.  Below is a list of the reporters for the three levels of federal courts:

Court Reporter Citation
U.S. Supreme Court

United States Reports (official)


Supreme Court Reporter (West)


United States Supreme Court Reports, Lawyer's Edition (Lexis)



S. Ct.


L. Ed. or
L. Ed. 2

U.S. Court of Appeals Federal Reporter F., F.2d, or F.3d
U.S. District Courts Federal Supplement F. Supp. or
F. Supp. 2d


Some reporters only include cases from a specific court.  For example, the United States Reports only publishes opinions from the Supreme Court of the United States.  On the other hand, some reporters includes cases from courts within a specific geographical region, also known as regional reporters.  For example, the South Eastern Reporter publishes reported cases from the southeastern United States, such as Georgia and North Carolina.  Moreover, some reporters only publish cases on a specific topic, such as bankruptcy or tax. 

In addition to these designations, reporters are also classified as official or unofficial reporters.  An official reporter simply means that it is the publication designated by statute or court order as official.  Generally it will contain only the text of the opinion.  A case published in an unofficial reporter will include the same text of the same case from the official reporter, but it will also include headnotes, topics, key numbers, and other aids to assist researchers.

Parallel Citations

As mentioned above, a case can be published in an official reporter and an unofficial reporter.  For that reason, a single case may have 2 or more citations.  When a case has more than one citation, the subsequent citations are known as parallell citations.  A classic example of this is Bush v. Gore, 531 U.S. 98, 121 S. Ct. 525, 148 L. Ed. 2d 388 (2000).

As one can see, not only is Bush v. Gore cited in the official reporter (United States Reports), but also in two unofficial reporters (Supreme Court Reporter and Lawyer's Edition

Reading a Case Citation

Case citations allow a researcher to find a case quickly and easily.  Similiar to statutory citations, all case citations follow the same structured format.  This enables researchers to clearly identify the parts of a citation and where to locate the case.

Here is a breakdown of the citation for Roe v. Wade, 410 U.S. 113 (1973).

Roe v. Wade 410 U.S. 113 1973
Case Name/Party Names Reporter Volume Reporter Abbreviation First Page of Case Date of Decision

From this, a researcher can determine that the case Roe v. Wade is located in United States Reports, Volume 410, Page 113.


Parallel Citations

The process is the same with parallel citations.  So if we use the previous example of Bush v. Gore, 531 U.S. 98, 121 S. Ct. 525, 148 L. Ed. 2d 388 (2000), the breakdown would look something like this:

Bush v. Gore 531 U.S. 98 121 S. Ct. 525 148 L. Ed. 2d 388 2000
Case Name/Party Names United States Reports, Volume 531, Page 98 Supreme Court Reporter, Volume 121, Page 525 Lawyer's Edition, Volume 148, Page 388 Date of Decision

Thus, a researcher would be able to either of these 3 reporters and find the same case using that reporter's volume and page numbers.  


Pinpoint Cite

A researcher may also come across a citation that includes an additional number after the page number.  This additional number, numbers or range of numbers are called pinpoint cites.  Cases and articles will often use these to refer researchers to exactly where the thought arose from.  Here is an example using Bush v. Gore, 531 U.S. 98 (2000).

Bush v. Gore, 531 U.S. 98, 100 (2000).  Citing specifically to page 100 of Volume 531 of the United States Reports.
Bush v. Gore, 531 U.S. 98, 100, 104 (2000). Citing specifically to pages 100 and 104 of Volume 531 of the United States Reports.
Bush v. Gore, 531 U.S. 98, 100-102 (2000). Citing specifically to pages 100 through 102 of Volume 531 of the United States Reports.


Federal Reporter Citation

Cases cited to Federal Reporter will have an extra element in the citation to identify the court.  Unlike the United States Reports, Supreme Court Reporter, and Lawyer's Edition, which only publishes cases from the Supreme Court of the United States, the Federal Reporter publishes cases from several different courts.  Therefore, cases published in these reporters include an element in the parentheses to identify the court that rendered the decision. 

Here is an example using United States v. MacDonald, 531 F.2d 196 (4th Cir. 1976).

United States v. MacDonald 531 F.2d 196 4th Cir. 1976
Name of Case/Party Names Volume Number Reporter Abbreviation First page of case Deciding Court Date of decision

In this case, the deciding court is 4th Cir. which means United States Court of Appeals, 4th Circuit.

Each circuit court will have its own abbreviation which will help the researcher identify the court that rendered the decision.  This is important for researchers because they might only want to find cases from their jurisdiction.  

Here is a table circuits and their abbreviations used in case citations for the United States Court of Appeals:

Court Abbreviation
First Circuit 1st Cir.
Second Circuit 2d Cir.
Third Circuit 3d Cir.
Fourth Circuit 4th Cir.
Fifth Circuit 5th Cir.
Sixth Circuit 6th Cir.
Seventh Circuit 7th Cir.
Eight Circuit 8th Cir.
Ninth Circuit 9th Cir.
Tenth Circuit 10th Cir.
Eleventh Circuit 11th Cir.
D.C. Circuit D.C. Cir.
Federal Circuit Fed. Cir.


Federal Supplement Citation

Similar to the Federal Reporter, cases cited to the Federal Supplement will also include an extra element in the citation.  Cases cited to the Federal Supplement are United States District Court decisions.  Therefore, an extra element will be included in these citations so that a researcher can determine which court rendered the decision.  

Here is an example using Jenkins v. Byrd, 103 F. Supp. 2d 1350 (S.D. Ga. 2000).

Jenkins v. Byrd 103 F. Supp. 2d 1350 S.D. Ga. 2000
Name of Case/Party Names Volume Number Reporter Abbreviation First page of case Deciding Court Date of decision

In this case, the deciding court was the S.D. Ga, which means the United States District Court,Southern District of Georgia.

Because there could be several United States District Courts inside one state, a researcher unfamiliar with a state may need to look up the court abbreviation to determine which court is referenced in the citation.  

Here is a brief list of some abbreviations for United States District Courts that might be most useful for researchers in Georgia: 

Court Abbreviation
Northern District of Georgia N.D. Ga.
Middle District of Georgia M.D. Ga.
Southern District of Georgia S.D. Ga.

For additional district court abbreviations, please refer to George Butterfield's libguide titled Legal Abbreviations.  

Additional Guides

Here are some research guides created by other law schools that might be helpful in explaining how to conduct case law legal research.

Disclaimer: The views and opinions of the authors expressed herein do not necessarily state or reflect those of the State of Georgia, and shall not be used for advertising or product endorsement purposes. Georgia State University College of Law and the authors of the works contained on this website do not assume or accept any legal liability or responsibility for the accuracy, currentness, or comprehensiveness of the content on this website. The content on this website does not in any manner constitute the issuance of legal advice or counsel. The information on this website is intended to provide resources that may aid the research of the topics presented, and are in no way a comprehensive list of sources one should consult on the topics presented. Please note that case law, statutory law, and administrative law may be modified and/or overturned. Additionally, because the laws vary between jurisdictions, the laws referred to herein may or may not be applicable to the law within the reader’s jurisdiction.