Compare treatises and case law as authorities and state when each is most useful in Applied Authorities 1.

• A. Case law provides general background; treatises provide binding rules.
• B. Treatises provide binding rules; case law provides analysis and guidance for locating authorities.
• C. Case law provides binding rules; treatises provide background, analysis, and guidance for locating authorities.
• D. Treatises and case law are equally binding in all circumstances.

Answer: (C)

The guiding idea is how authorities function in legal research: case law creates binding rules that govern outcomes, while treatises offer background, analysis, and guidance for locating authorities. Case law is where the rules that actually control decisions come from, since court opinions establish precedents and statutory interpretation that courts must follow. Treatises, authored by experts, explain how those rules work, discuss their scope and nuances, and synthesize authorities to help you understand the law—plus they show how to find the right primary sources, such as leading cases, statutes, and regulations. Because of that, treatises are invaluable for context and research strategy, but they do not bind a court the way case law does. The other options misstate these roles: treating sources don’t impose binding rules, and case law isn’t merely background analysis.