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Legal research isn't just about finding information. It's about finding the right information and knowing how to use it. In this course, you're being tested on your ability to distinguish between different types of legal authority, navigate complex databases, and verify that the law you're citing is still good law. These skills form the backbone of every legal argument, whether you're drafting a memo, preparing for trial, or analyzing a hypothetical on an exam.
The techniques in this guide connect to broader concepts like the hierarchy of legal authority, statutory interpretation, precedent and stare decisis, and administrative rulemaking. When you encounter a research question, don't just think about where to find the answer. Think about why that source carries weight and how it fits into the legal system's structure.
Before you can research effectively, you need to understand what you're looking for and why it matters. Legal sources exist in a hierarchy, and knowing where a source falls determines how much weight it carries in your argument.
These are binding legal authority: the actual rules that courts must follow. They include statutes, constitutions, regulations, and case law from the relevant jurisdiction. Primary sources are created by governmental bodies with lawmaking power: legislatures enact statutes, courts issue opinions, and agencies promulgate regulations.
Primary sources are always your end goal in research. Secondary sources help you find them, but primary sources are what make your argument.
These are commentary and analysis that explain, interpret, or critique primary law. They're never binding on a court, but they can be persuasive. This category includes legal encyclopedias, treatises, law reviews, and practice guides written by scholars and practitioners.
Secondary sources are often the best starting point when you're unfamiliar with a topic. They provide context and, crucially, point you toward the relevant primary authority you'll actually cite.
Compare: Primary vs. Secondary Sources: both are essential to research, but they serve different functions. Primary sources are the law; secondary sources explain the law. On an exam asking you to identify authoritative support, always prioritize primary sources.
Modern legal research relies heavily on sophisticated databases and search techniques. Understanding how these tools organize and retrieve information makes the difference between hours of frustration and efficient, targeted results.
These platforms give you comprehensive access to virtually all published case law, statutes, regulations, and secondary sources in searchable formats. Their advanced search features include filters by jurisdiction, date, court level, and practice area, so you can narrow results quickly.
One practical note: these are subscription services. In practice, knowing how to use them efficiently saves real time and money. Your school likely provides access to one or both, so take advantage of that while you can.
Boolean operators are logical connectors that let you combine or exclude search terms to refine your results. The core operators are:
Digests organize case law by topic using standardized classification systems, making it easier to find cases addressing specific legal issues. West's Key Number System assigns unique identifiers to legal concepts, allowing you to trace related cases across jurisdictions.
Think of digests as a bridge between concepts and cases. When you know the legal issue but not the case name, digests are your entry point.
Compare: Boolean Searching vs. Digest Research: Boolean searches work best when you know specific terms or phrases. Digests work best when you know the legal concept but not the terminology courts use. Strong researchers use both approaches.
Finding a case isn't enough. You must confirm it's still good law. Courts overrule, distinguish, and limit prior decisions constantly, and citing bad law destroys your credibility.
These are citator services that track every subsequent reference to a case, revealing whether it's been affirmed, reversed, overruled, or distinguished by later courts.
Both systems use signal indicators to give you quick visual warnings:
This is a non-negotiable final step. Never cite a case in a legal document without checking its treatment first.
Compare: Shepardizing vs. KeyCiting: both accomplish the same goal (validating cases) but on different platforms (LexisNexis vs. Westlaw). Learn whichever system your school provides, but understand that the concept of citation verification is what matters.
Different types of legal authority require different research approaches. Statutes, cases, and regulations each have their own structure, sources, and interpretive tools.
Legislative history examines a statute's development through committee reports, floor debates, hearing transcripts, and earlier bill versions. Courts turn to these materials when statutory language is ambiguous and they need to determine what lawmakers intended.
You can access these materials through government websites (Congress.gov for federal statutes, state equivalents for state law) and through compiled legislative histories available in Westlaw and LexisNexis.
Regulations have the force of law when properly promulgated by agencies with delegated authority from legislatures. Researching administrative law requires you to:
Compare: Statutory vs. Case Law Research: statutes give you the rule; cases show you how courts apply it. Effective research almost always requires both. If an exam question asks about interpreting a statute, discuss both the text and relevant case law.
Secondary sources do the heavy lifting early in your research by explaining complex topics and pointing you toward primary authority. Knowing which type to use, and when, makes your research more efficient.
Encyclopedias like American Jurisprudence (Am. Jur.) and Corpus Juris Secundum (C.J.S.) provide broad overviews of legal topics with citations to leading cases. They're ideal for getting oriented quickly when a topic is new to you.
Treatises offer in-depth analysis of specific practice areas, often written by recognized experts whose interpretations courts may cite. For example, Prosser on Torts or Corbin on Contracts are treatises that carry real weight.
Use encyclopedias for breadth, treatises for depth. Start general to get your bearings, then go deep once you've identified your specific issue.
Scholarly articles in law reviews analyze legal issues in depth, often proposing new interpretations or critiquing existing doctrine. Student notes and comments published in these journals can be particularly useful for understanding emerging issues or circuit splits (where different appellate courts have reached conflicting conclusions on the same legal question).
These sources are persuasive but not binding. Courts occasionally cite law review articles, especially on novel questions without clear precedent.
Compare: Encyclopedias vs. Treatises: encyclopedias cover everything briefly; treatises cover one area thoroughly. Choose based on whether you need a quick overview or comprehensive analysis of a specialized topic.
Knowing the tools isn't enough. You need a systematic approach. How you structure your research and communicate your findings determines your effectiveness.
Most research requires both. A good approach is to identify the legal issue first, then find cases with facts similar enough to be persuasive in your specific situation.
The IRAC structure (Issue, Rule, Application, Conclusion) organizes legal analysis in a format readers expect:
Synthesis of authority means weaving together multiple cases and statutes to build a coherent argument, not just listing sources one after another. And precision in language matters enormously in legal writing. Legal terms have specific meanings, and sloppy word choice undermines credibility.
The Bluebook provides standardized citation rules so readers can locate your sources and assess their authority at a glance. It has specific formats for cases, statutes, regulations, and secondary sources.
Two Bluebook features worth understanding early:
Compare: Fact-Based vs. Issue-Based Research: fact-based research helps you predict outcomes; issue-based research helps you understand the law. Start with issues to learn the rules, then shift to facts to apply them to your situation.
| Concept | Best Examples |
|---|---|
| Primary Authority | Statutes, case law, regulations, constitutions |
| Secondary Authority | Legal encyclopedias, treatises, law reviews |
| Database Research | Westlaw, LexisNexis, Boolean operators |
| Case Validation | Shepardizing, KeyCiting, citator signals |
| Statutory Interpretation | Legislative history, annotated codes, committee reports |
| Research Organization | Digests, indexes, key number system |
| Research Strategy | Fact-based approach, issue-based approach, IRAC |
| Citation and Writing | Bluebook format, signals, parentheticals |
You find a 2015 case that perfectly supports your argument. What must you do before citing it, and what tools would you use?
Compare and contrast legal encyclopedias and treatises. When would you choose one over the other in your research process?
A statute's plain language seems to support your client's position, but opposing counsel argues the legislature intended something different. What type of research would help resolve this dispute, and where would you find the relevant materials?
How do Shepardizing/KeyCiting and Boolean searching address different stages of the research process? Explain how they complement each other.
Your supervising attorney asks you to research an unfamiliar area of administrative law. Outline your research strategy, identifying which sources you'd consult first and why, distinguishing between secondary and primary sources in your approach.