Precedent Study Guide

📖 Core Concepts Precedent – A judicial decision that guides later cases that are identical or similar. Stare Decisis – “To stand by things decided”; courts follow prior rulings to ensure consistency. Binding vs. Persuasive – Binding precedent must be followed; persuasive precedent may be considered but is not obligatory. Ratio Decidendi – The essential legal reasoning that creates binding precedent. Obiter Dicta – Extra comments not needed to resolve the case; generally non‑binding but can be persuasive. Horizontal Stare Decisis – A court follows its own earlier decisions. Vertical Stare Decisis – Lower courts follow decisions of higher courts in the same hierarchy. Per Incīram – A decision made without knowledge of a controlling authority; may be set aside. 📌 Must Remember Binding precedent flows downward (higher → lower) and laterally (same court’s own rulings). Persuasive authority includes foreign judgments, dicta, and decisions from other jurisdictions. The U.S. Supreme Court overrules its own cases only with a “compelling justification.” 1966 Practice Statement – Allows the UK House of Lords/Supreme Court to overrule its own precedents, but it does so rarely (< 20 times). Per incīram applies only when the missing authority would definitely change the outcome. Statutory interpretation hierarchy (UK): Literal → Golden (narrow/broad) → Mischief. U.S. statutory interpretation uses the literal rule first, then canons of construction; once resolved, the interpretation binds future cases. 🔄 Key Processes Determine Precedent Type Identify if the prior decision is binding (same jurisdiction, higher court) or persuasive (different jurisdiction, obiter, foreign). Apply Stare Decisis Check vertical hierarchy → apply higher‑court rule. If same court, apply horizontal rule. Look for distinguishing facts; if material facts differ, the precedent may be avoided. Overruling / Distinguishing Assess whether the prior case is per incīram or was decided per incuriam. If a higher court has expressly overruled, treat as no longer binding. Statutory Interpretation (UK) Literal Rule → if absurd, apply Golden Rule (narrow → broad) → if still unsatisfied, use Mischief Rule. Federal‑State Interaction (U.S.) Federal courts follow state‑law precedent on state‑law issues (Erie doctrine). State courts follow U.S. Supreme Court on federal law, not lower federal courts. 🔍 Key Comparisons Binding vs. Persuasive – Binding = mandatory; Persuasive = optional. Ratio Decidendi vs. Obiter Dicta – Ratio = core legal principle (binding); Obiter = ancillary comment (non‑binding). Horizontal vs. Vertical Stare Decisis – Horizontal binds a court to its own past rulings; Vertical binds lower courts to higher courts. Literal vs. Golden vs. Mischief Rules (UK) – Literal = plain meaning; Golden = modify to avoid absurdity; Mischief = achieve law’s purpose. Strong vs. Weak Conception of Stare Decisis – Strong: requires special justification to overrule; Weak: allows overruling when prior reasoning is bad. ⚠️ Common Misunderstandings “All obiter dicta are useless.” – They can be cited as persuasive authority. “A lower court can ignore a higher‑court decision if it disagrees.” – Disagreement is not enough; only distinguishing facts or per incīram can break binding precedent. “Unpublished opinions have no precedential value.” – Generally uncitable, but may be de‑published and then used. “Stare decisis prohibits any change.” – Courts may overrule with compelling justification (especially the Supreme Court). 🧠 Mental Models / Intuition “Tree of Authority” – Visualize a hierarchy tree: Root = Supreme Court, branches = appellate courts, leaves = trial courts. Follow the branches downward. “Rubber Band Test” for per incīram: If the missing authority would snap the decision (i.e., change it), the precedent fails. “Three‑Step Ladder” for UK statutes: Step 1 literal → Step 2 golden (avoid absurd) → Step 3 mischief (purpose). 🚩 Exceptions & Edge Cases De facto binding precedent in civil‑law jurisdictions (e.g., French Cour de Cassation decisions). Mixed legal systems (Scots, South African, Quebec) blend civil‑law codes with common‑law precedent. Binding obiter – Supreme Court can turn an obiter statement into binding law when it explicitly tells a prior precedent to be set aside. Federal courts predicting state law when no controlling state decision exists. 📍 When to Use Which Choose binding precedent when the case lies within the same jurisdiction and hierarchy. Turn to persuasive precedent when no binding authority exists or when seeking supportive reasoning from other jurisdictions. Apply the literal rule first for statutory language; if the result is absurd, switch to the golden rule; if still unsatisfactory, use the mischief rule. Use per incīram only when a controlling authority was unknown and would have definitely altered the outcome. 👀 Patterns to Recognize Fact‑Distinction Pattern – Look for a single material fact that differs from the precedent; this often signals a viable way to avoid binding precedent. Overrule Signal Words – Phrases like “the Court hereby overrules” or “the prior decision is no longer good law.” Citation of Foreign or Academic Sources – Indicates reliance on persuasive authority rather than binding precedent. 🗂️ Exam Traps Choosing “binding” for a foreign decision – Foreign judgments are persuasive, not binding. Assuming all dicta are irrelevant – Obiter can be persuasive and sometimes become binding if the Court explicitly adopts it. Confusing per incīram with mere disagreement – Per incīram requires lack of knowledge of a controlling authority, not just a different view. Mixing up vertical and horizontal stare decisis – Remember: vertical = lower courts follow higher; horizontal = a court follows its own prior rulings. Overlooking the 1966 Practice Statement – Even though the UK Supreme Court can overrule itself, it does so sparingly; exam questions may test the rarity of such overrulings.