Sources of Legal Research
Because the law is so varied, there are many different resources available to help locate the law, each with a specific use and specific limitations. The major types of legal research resources are primary sources of law and secondary sources of law.
By contrast,
Primary Sources
There are three main categories of primary sources of the law. They are statutory law, administrative regulations, and case law.
Statutory Law
Statutory law is any law enacted by a legislature and includes constitutions. It is also called
Even though statutes are intended to be available to the public, locating the appropriate statutory law can be surprisingly difficult. There are several sources for locating statutory law; which of these sources you use will depend on the nature of the client's problem.
If the client's problem involves the application of a new law or a recent amendment of an old law, your legal research should begin with the most recent version of the statute. In most states, the earliest version of an effective statute is the
There are bound volumes of slip laws called session laws; compilations of slip laws in the order they were passed by the legislature. Each volume of session laws represents the work of one session of the legislature and will cover a myriad of topics. Many compilations of session laws use underlines and strikethroughs to show the additions and deletions in amended statutes. Session laws are the basis for the publication of official statutory codes.
Because session laws are not organized in a topical fashion, using them for research is difficult. To make locating statutes easier, the session laws are organized, or codified, for publication. A codified statute is assigned a number that follows a topical organization. While each state uses a different topical organization, the structure of most state codes follow a variation of the title (topic), chapter (sub-topic), and individual statute hierarchy.
The government publishes official statutory codes. Typically, these official codes contain only the text of the statutes and the history of the statute as reflected in the session laws. In the event of a discrepancy between the official code and any other version of the statute, the official code controls. The official statutory code of the federal government is the
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Legal research cannot be learned from a book or in a classroom. Go to a law library and take down a book. Begin reading. When you have a question, look for the answer to that question — either in the book you are using, or some other book. Begin your legal research in the library, especially in the early stages of your career. Know what the books are and how they are organized before you attempt any form of computer-assisted research.
Because official codes provide only statutory information, legal researchers have the option of referring to an unofficial code. These unofficial codes are published by private legal publishers and usually contain additional information not found in the official code. For example, West Publishing offers the
Administrative Regulations
Administrative regulations are forms of law promulgated by administrative agencies. If the legislature has enabled the agency to make rules addressing a specific topic, the pronouncements of the agency have the force of law. Administrative law is found in two places: the statutes enacted by the legislature and the rules and regulations of the agency itself. The legal researcher must consult both sources.
There are two main statutes that govern the effect of an administrative rule or regulation. Most states and the federal government have an Administrative Procedures Act. This statute applies to all administrative agencies and sets forth the process the agency must follow in promulgating new rules and regulations. For each individual agency there is a specific statute defining the purpose and authority of the agency. This is known as the enabling legislation.
Some agencies require little in the way of specific rules and regulations to do their work. Other agencies have extensive sets of rules and regulations covering many topics within their authority. In all cases, these rules and regulations are usually found in an administrative code that contains all the rules and regulations of the agencies created in that jurisdiction. In the federal government, this administrative code is called the
Case Law
Case law is the record of the opinions of judges in deciding cases. Each jurisdiction has its own set of case law. The decisions of trial-level courts are seldom reported because they are not binding on any other court. Nevertheless, trial court opinions are sometimes useful where no other authority exists. For this reason, the federal court system and some state court systems make certain that written trial court opinions are available in electronic format. Use caution when referring to these decisions, however, as they are the least permanent of all court decisions.
The vast majority of reported decisions are written opinions from the appellate courts of the jurisdiction. Most states have one or two levels of appellate court — a state supreme court and an intermediate appellate court. In some states, such as New York and California, there are additional appellate levels. Each court has a specific abbreviation that identifies the court's position in the judicial hierarchy. These abbreviations are part of the citation to the opinion.
Fact
The standardized system of identifying the location of court opinions makes it possible to locate any reported court opinion in the United States. This system has become so much a part of legal usage that a major publisher of legal materials lost a lawsuit in which it claimed proprietary control over its standard pagination. Other legal publishers now use the same pagination system.
The opinions of each appellate court are published in bound volumes known as
Secondary Sources
Constitutions, statutes, and case law are primary materials. These items comprise “the law.” All other materials are secondary legal sources. Secondary sources contain summaries of the law and commentaries on the law. Although they are not the law itself, they are valuable resources to the legal researcher.
Alert
Secondary sources often contain clearer descriptions and explanations of the law than primary sources. In addition, court opinions sometimes rely on secondary sources to help explain a particular interpretation of the law. For all this, secondary sources are not the law and should not control your interpretation of the law on behalf of your client.
Legal Encyclopedias
Legal encyclopedias are summaries of general legal principles.
The publishers of legal encyclopedias organize the law by topics and provide an outline of the law on that topic with references to major case opinions and statutes explaining the topic.
The major legal encyclopedias are
Treatises
Some of the pre-eminent legal scholars in the last century concentrated their legal studies in a specific area of the law. Their writings about that area of the law have been compiled into a treatise. A
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Secondary authorities are usually organized around a specific legal topic. The legal topic is divided into several subtopics. A paralegal asked to research an unfamiliar issue should start by locating a good secondary authority addressing the issue. The secondary authority provides an overview of the area of law, a structure to the law not found in primary authorities, and helps focus the review of primary authorities in fruitful directions.
Digests
When an appellate court decides a case, its opinion might address several legal principles. For example, an appeal from a criminal conviction can raise issues of interpretation of a statute, admissibility of character evidence, and the constitutionality of a confession. Not all of these issues are relevant to the legal researcher, so the publishers of legal digests provide indexes that reference the opinion under each topic discussed by the court. These indexes are organized by legal topic and include short summaries of the portion of the opinion that discusses each topic. The compilation of these indexes and summaries is called a digest.
A digest allows the legal researcher to locate topical case law quickly and easily. The most popular digest system is published by West and utilizes an index system developed by West called the key number system. Under this system, specific areas of the law are divided into topics (key numbers) and subtopics. The summaries contained in the West digest system also appear as headnotes, or topical summaries. Because the headnotes are not a part of the official court opinion, they are not primary law, but are an indispensable aid in locating primary law on a specific topic.
Restatements
Many areas of the law have deep historical roots. The law in these areas has expanded and developed over the years, sometimes resulting in confusion about the current state of the law. To help the legal researcher understand the legal principles that govern a specific area of the law, committees made of legal scholars, judges, and lawyers have prepared restatements of some areas of the law. These restatements summarize the rules of law and provide detailed explanations showing the application of the law to facts. Restatements also provide explanations about the historical development and policies behind specific legal principles. Restatements are considered so accurate that specific portions of some restatements have been adopted as rules of law in many jurisdictions. The publishers of the restatements include these references in separate volumes. There are restatements of the law of torts, product liability, contracts, property, judgments, and agency.
Annotations
Annotations are information about the interpretation of statutes. All federal and state statutes are available in an annotated version. The annotated version is rarely the official version of the statute, but annotated versions are commonly cited when it is necessary to refer to the language of a particular statute.
An annotation is supplemental information about the statute. Typical annotations contain the history of the statute, including the date of first enactment, dates and substance of any amendments, and the effective date of any changes to the statute. This information is important if the language of the statute has changed in a way that affects the client's legal problem. Annotations also include related statutes, references to law review articles or other commentary concerning the statute, and an index to various topics the courts have addressed in interpreting the statute.
The topical index to a court opinion interpreting a statute uses the same information contained in case headnotes. The summaries of court opinions referring to a specific statute are listed immediately after the statute in an annotated volume. These references are useful when the legal researcher is attempting to determine whether the courts have applied the statutory language to a factual situation similar to the client's.

