Bar Exam (Next Generation) Quiz: Assess Authoritative Weight Of Sources
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Assess Authoritative Weight Of SourcesQuestion 1 of 12

A federal court must interpret the phrase 'navigable waters' in a statute administered by the Environmental Protection Agency. The court has before it: (1) an EPA legislative rule adopted after notice and comment that defines the phrase; (2) an EPA interpretive guidance document issued without notice and comment; (3) an EPA policy statement; and (4) an EPA amicus brief filed in a different case. The documents define the phrase in different ways.

Which source is most likely to be treated as carrying the greatest authoritative weight?

The amicus brief, because it is the agency's litigation position and is most directly aimed at court interpretation.
The interpretive guidance, because it reflects the agency's current understanding of the statute and was written for regulated parties.
The policy statement, because it applies generally to all regulated parties and represents the agency's considered position.
The notice-and-comment legislative rule, if it is a valid exercise of authority Congress delegated to the EPA, has the force of law and should be given the greatest weight.
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Bar Exam (Next Generation) Quiz

Bar Exam (Next Generation) Quiz: Assess Authoritative Weight Of Sources

Practice Assess Authoritative Weight Of Sources in Bar Exam (Next Generation) with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Assess Authoritative Weight Of Sources, giving you a quick way to practice the rules, question types, and explanations that matter most for Bar Exam (Next Generation).

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

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Question 1

A federal court must interpret the phrase 'navigable waters' in a statute administered by the Environmental Protection Agency. The court has before it: (1) an EPA legislative rule adopted after notice and comment that defines the phrase; (2) an EPA interpretive guidance document issued without notice and comment; (3) an EPA policy statement; and (4) an EPA amicus brief filed in a different case. The documents define the phrase in different ways.

Which source is most likely to be treated as carrying the greatest authoritative weight?

  1. The amicus brief, because it is the agency's litigation position and is most directly aimed at court interpretation.
  2. The interpretive guidance, because it reflects the agency's current understanding of the statute and was written for regulated parties.
  3. The policy statement, because it applies generally to all regulated parties and represents the agency's considered position.
  4. The notice-and-comment legislative rule, if it is a valid exercise of authority Congress delegated to the EPA, has the force of law and should be given the greatest weight. (correct answer)
Explanation: Whenever you see a question about which agency interpretation carries the most weight, focus on one threshold: did Congress authorize this source to have the force of law? A notice-and-comment legislative rule satisfies that test if the EPA acted within its delegated authority and followed required procedures. Such a rule binds courts and the public under binding Chevron-style deference, so it should be given the greatest weight. Each other source is a weaker form of agency guidance. The amicus brief is merely a litigation position—advocacy aimed at a particular case, not a considered, broadly applicable interpretation. The interpretive guidance reflects the agency's current understanding, and courts may give it some respect, but it was not adopted through notice and comment and carries no legal force. The policy statement is also general and may represent agency views, but by definition it is not binding and lacks the procedural pedigree of a legislative rule. None of these can outrank a valid legislative rule. Remember the hierarchy: legislative rules with delegated authority and proper procedure stand at the top; interpretive rules, policy statements, and litigation positions fall below. On the bar exam, when a source has "force of law" language, that is your signal to choose it.

Question 2

Carla is preparing a brief for a state court. She locates the U.S. Supreme Court's decision in Mendoza v. Hart in a commercial database. Above the opinion are numbered headnotes prepared by the database. The version in the official U.S. Reports also begins with a syllabus. The headnote and the syllabus state a proposition more broadly than the Court's opinion. Carla wants to quote them because they are concise.

Which statement best describes the proper weight of the headnote and syllabus?

  1. Neither the database headnotes nor the U.S. Reports syllabus is part of the Court's opinion; they are editorial aids and do not themselves carry authoritative weight. (correct answer)
  2. The U.S. Reports syllabus is prepared under the Reporter of Decisions' supervision and has the same precedential weight as the Court's opinion.
  3. Database headnotes are authoritative because they are prepared by legal editors who specialize in the relevant subject matter.
  4. Both are authoritative if they accurately restate a holding; if they conflict with the opinion, the more concise statement should control.
Explanation: When you see a question about the weight of a court opinion's accompanying materials, remember the key distinction: only the Court's own opinion—its reasoning and holdings—creates binding precedent. The headnotes in a commercial database and the syllabus printed in the U.S. Reports are both editorial aids. They are prepared to help readers navigate the opinion, not to add or alter the law. Therefore, the statement that best describes their weight is that neither is part of the Court's opinion and neither carries authoritative weight on its own. The U.S. Reports syllabus is indeed prepared under the Reporter of Decisions' supervision, but supervision does not make it part of the opinion; it remains a summary and does not have the same precedential weight as the Court's own words. Database headnotes are similarly useful research tools, but their authority comes from the opinion they summarize, not from the editors who write them. And the idea that either source becomes authoritative if it accurately restates a holding, or that a concise statement should control over the opinion, inverts the proper hierarchy: when a headnote or syllabus conflicts with the opinion, the opinion controls. On the bar exam, treat any prefatory or editorial material—syllabus, headnotes, summaries—as a map, not the territory. Always check the actual holding in the opinion itself before relying on a concise restatement.

Question 3

In a state where neither the legislature nor the highest court has addressed an issue, plaintiff's counsel argues that the Restatement (Third) of Torts is controlling because the American Law Institute is an official body, the Restatement reflects the common law, and many courts have adopted it. Defense counsel responds that the Restatement is secondary authority and may be considered only if not contradicted by binding law.

Which statement is correct?

  1. The Restatement may not be cited in a jurisdiction that has not adopted it, because secondary sources are not law.
  2. The Restatement is binding because the American Law Institute is an official lawmaking body with delegated authority to restate the law.
  3. The Restatement is primary authority because it restates the common law, but it yields to statutes and later cases.
  4. The Restatement is secondary authority; it is persuasive, but it is not controlling unless the state's highest court has adopted its rule or the legislature has enacted it. (correct answer)
Explanation: Whenever you see a question about sources of law, your first move is to sort primary from secondary authority. Primary authority—constitutions, statutes, regulations, and binding case law—actually controls. Secondary authority, like the Restatements, law review articles, and treatises, is persuasive only. Here, the Restatement (Third) of Torts is exactly that: secondary authority. It reflects the ALI's scholarly view of what the common law should be, not the command of any legislature or court. So it may be cited and considered, and it can be persuasive if its reasoning is sound, but it is not controlling unless the state's highest court has adopted its rule or the legislature has enacted it. That is why the correct statement is the one saying the Restatement is persuasive, not controlling, absent adoption. Now the traps. The choice saying the Restatement "may not be cited" in a non-adopting jurisdiction is too absolute; courts routinely consider persuasive secondary sources. The choice calling the ALI an "official lawmaking body" confuses a private, influential institute with an actual government actor—it has no delegated authority to make law. And the choice treating the Restatement as "primary authority because it restates the common law" mistakes the map for the territory: a restatement is evidence of the common law, not the law itself. The final piece—"yields to statutes and later cases"—describes how primary authority behaves, so it cannot describe a Restatement. Your study tip: when you see a source in a citation question, ask "who made this?" Government actors make binding law; private experts make persuasive commentary.

Question 4

In 2008, the State Supreme Court in Teller v. State held that a worker's retaliation claim accrues when the employer makes the adverse employment decision. In 2017, the legislature amended the retaliation statute to provide that a claim accrues when the worker discovers the adverse action. A 2019 State Supreme Court decision applied the 2017 amendment but did not mention Teller. In 2024, an employer argues that Teller remains binding because it was never expressly overruled.

Which statement best describes Teller's current weight?

  1. Teller remains binding only if the parties in the 2024 case failed to raise the 2017 amendment in their pleadings.
  2. Teller remains fully binding because only a court may overrule a judicial interpretation of a statute, regardless of later legislative amendments.
  3. Teller has no continuing effect even for pre-amendment claims because the amending statute implicitly overruled the decision.
  4. Teller remains binding for claims that accrued before the 2017 amendment took effect if the amendment is not retroactive; the amended statute supersedes it for later accruing claims. (correct answer)
Explanation: When you see a question about how much precedential weight an old case has after a statute changes, the key is separating what law governed the claim at the time it accrued from what law governs now. Courts generally presume statutes apply prospectively unless the legislature clearly makes them retroactive. Here, the 2017 amendment changed the accrual rule by statute. A legislature can effectively supersede a judicial interpretation of a statute by amending that statute—it does not need a court to expressly overrule the old case. So Teller remains binding only for claims that accrued before the amendment took effect, assuming the amendment is not retroactive. For claims accruing after 2017, the amended statute controls. The 2019 decision applying the amendment without mentioning Teller is consistent with this: it treated the amendment as the governing law. The claim that Teller remains binding only if the parties failed to raise the amendment in their pleadings is wrong because courts apply the current law, and a pleading omission does not keep an obsolete interpretation alive. The claim that Teller remains fully binding because only a court can overrule a judicial interpretation is wrong because legislatures may amend statutes to displace judicial interpretations. The claim that Teller has no continuing effect even for pre-amendment claims is wrong because absent retroactivity, pre-amendment claims are governed by the old law. Your takeaway: when a statute changes after a court decision, ask when the claim accrued and whether the statute is retroactive. That tells you which version of the rule controls.

Question 5

The U.S. Supreme Court recently denied a petition for a writ of certiorari in Marcus v. City of Elkins. The denial left in place a decision of the Fifth Circuit rejecting a constitutional challenge to a city ordinance. A plaintiff in a different circuit now cites the denial of certiorari as evidence that the Fifth Circuit's interpretation is correct and asks the court to treat it as controlling.

What is the correct weight of the denial of certiorari?

  1. It makes the Fifth Circuit decision controlling only within the Fifth Circuit, but not in other circuits.
  2. It is a merits decision that binds lower courts to the Fifth Circuit's result in Marcus and to its reasoning.
  3. It has no precedential value and expresses no view on the merits; the Fifth Circuit decision has only whatever persuasive force its reasoning provides. (correct answer)
  4. It is conclusive on the constitutional question between the parties to Marcus, but it has no effect on other litigants.
Explanation: Whenever you see a question about the Supreme Court's denial of certiorari, remember that a cert denial is not a decision on the merits. The Court denies petitions for many reasons unrelated to whether the lower court was right—docket management, procedural concerns, or a desire to let an issue percolate. Therefore, the denial itself carries no precedential weight and expresses no view on the constitutional question. The only thing left standing is the Fifth Circuit's opinion in Marcus, and in another circuit that opinion may be cited only for whatever persuasive force its reasoning provides. The choice saying the denial makes the Fifth Circuit decision controlling only within the Fifth Circuit, but not in other circuits, confuses the denial with the underlying decision. The Fifth Circuit decision is already binding within that circuit because it is a Fifth Circuit decision, not because the Supreme Court denied review. The choice calling the denial a merits decision that binds lower courts to both the result and reasoning is the opposite of the law—denials create no binding precedent. Finally, the choice saying it is conclusive on the constitutional question between the parties is also wrong: denial leaves the judgment intact for those parties, but it is not a Supreme Court ruling on the constitutional issue, even between them. Study tip: If you see "denied certiorari," immediately think "no precedential value, no merits view." Do not equate denial with approval.

Question 6

A state court of appeals issued a published opinion on the merits, not realizing that the notice of appeal was filed three days late. The state supreme court later granted review, held that the court of appeals lacked appellate jurisdiction because the notice was untimely, and vacated the opinion. In a later case, a litigant cites the vacated opinion as authority.

What is the best statement about the vacated opinion's weight in the later case?

  1. It remains persuasive authority because it was published and reasoned before the supreme court vacated it.
  2. It has no precedential effect; a decision by a court without jurisdiction is void, and the vacatur removes any authority it might otherwise have had. (correct answer)
  3. It is binding within the appellate district unless the state supreme court expressly states that it is not.
  4. It remains binding on the parties to the original appeal and is also persuasive authority in later cases.
Explanation: When you see a question about the weight of a vacated opinion, your first move is to ask: did the issuing court have jurisdiction? Jurisdiction is the power to decide at all; without it, every word the court says is legally void. Here, the notice of appeal was late, so the court of appeals never had appellate jurisdiction. Its published opinion was therefore a nullity from the start, and the state supreme court's vacatur formally erased it from the body of citable law. In the later case, the opinion has no precedential effect at all. The wrong answers each mistake the surface form for legal effect. The choice saying the opinion "remains persuasive authority because it was published and reasoned" ignores that vacatur removes authority regardless of how well-reasoned it is. The choice saying it is "binding within the appellate district unless the supreme court expressly states that it is not" confuses ordinary appellate precedent with a void decision—a court without jurisdiction cannot create binding law, and the supreme court already vacated it. Finally, the choice saying it "remains binding on the parties to the original appeal and is also persuasive authority" fails because vacatur nullifies the opinion for everyone, including those original parties. Study tip: treat "lack of jurisdiction" and "vacated" as twin red flags—both mean the decision is dead weight. Check jurisdiction before you ever weigh an opinion's authority.

Question 7

A federal statute is ambiguous. The parties offer the following sources: (1) the enacted statutory text; (2) a Senate committee report; (3) a floor statement by the bill's sponsor; (4) a law review article by a former congressional staffer who helped draft the bill. The committee report and floor statement point in opposite directions.

Which source should a court treat as having the greatest authoritative weight in determining the statute's meaning?

  1. The Senate committee report, because committee reports are the most reliable evidence of congressional intent in a statutory interpretation dispute.
  2. The enacted statutory text, because it is the law; if it remains genuinely ambiguous, the court may consider the other sources as persuasive aids. (correct answer)
  3. The sponsor's floor statement, because the sponsor was directly involved in drafting the bill and knows its purpose.
  4. The law review article, because it provides independent scholarly analysis of the drafting history and is more objective than the parties' submissions.
Explanation: When you see a statutory interpretation question, start with the hierarchy of authority: the enacted text is the law; everything else is evidence about what the law might mean. That ordering should drive your analysis. Here, the enacted statutory text is the source of greatest authoritative weight. Courts interpret statutes by first reading the actual words Congress enacted. If the text is genuinely ambiguous, the court may consult legislative history and other materials as persuasive aids — but none of those can override or replace the text itself. Since the Senate committee report and the sponsor's floor statement point in opposite directions, they cancel each other out as reliable evidence and leave the text as the anchor. The Senate committee report is wrong if offered as the most reliable evidence of intent; committee reports are often considered among the more dependable forms of legislative history, but they are not the law and cannot outweigh enacted text. The sponsor's floor statement is also not authoritative; even a drafter's personal understanding does not control if the enacted language is ambiguous. The law review article by a former staffer is only secondary authority — scholarly commentary may be persuasive, but it is the least authoritative source here, not a substitute for the statutory text. Your study takeaway: on bar questions, distinguish between "the law" and "evidence of meaning." Enacted text always comes first; legislative history and secondary sources are aids only after genuine ambiguity remains.

Question 8

The U.S. Supreme Court summarily affirmed a three-judge district court's judgment in Wexler v. Board of Elections without issuing an opinion. The district court had invalidated a redistricting plan on two alternative grounds: violation of the Equal Protection Clause and violation of the Voting Rights Act. The summary affirmance did not explain which ground it adopted. A litigant in a later case asks a court to treat the summary affirmance as binding authority for both grounds.

What is the correct statement about the summary affirmance's weight?

  1. It has no precedential value at all because the Supreme Court did not explain the reasoning behind its affirmance and summary dispositions are not decisions on the merits.
  2. It is a decision on the merits, but its precedential effect extends only to precise issues necessarily decided; lower courts should not assume it adopted every ground of the lower court's opinion. (correct answer)
  3. It is binding authority for both the equal protection and Voting Rights Act grounds because the Court affirmed the entire judgment without qualification.
  4. It binds only the parties to Wexler and cannot be cited by nonparties in later cases because it was issued without a written opinion.
Explanation: When you see a summary affirmance from the Supreme Court, don't confuse "unexplained" with "meaningless." A summary affirmance is a decision on the merits, but it is a narrow one: its precedential weight extends only to issues that were necessarily decided by the Court's judgment, not to every argument or alternative ground in the lower court's opinion. Here the district court gave two independent grounds—equal protection and the Voting Rights Act—and the Supreme Court affirmed without saying which it adopted. A later court cannot assume the summary affirmance endorsed both grounds; maybe the Court agreed with only one, or even with the result on a narrower basis. Therefore the correct view is that the affirmance is on the merits but its effect is limited to precisely what was necessarily decided. The choice saying it "has no precedential value at all" is wrong: summary dispositions are merit decisions, so they can carry precedent—just not broad precedent. The choice claiming it is "binding authority for both grounds because the Court affirmed the entire judgment" overreads unchecked: affirming a multi-ground judgment does not mean the Court adopted every reason in it. And the choice saying it "binds only the parties and cannot be cited by nonparties" confuses res judicata withstare decisis: a summary affirmance may be cited as precedent for the issues it necessarily decides, though its reach is limited. Your study takeaway: for any unexplained affirmance, ask "What was the minimal issue or result the Court had to decide to affirm?" Treat the lower court's elaborate reasoning as persuasive, not necessarily adopted.

Question 9

An Arizona state court is deciding a federal due process challenge to a state procedure. The plaintiff relies on a decision of the U.S. Court of Appeals for the Ninth Circuit squarely holding the procedure unconstitutional under the federal Due Process Clause. The defendant relies on an older U.S. Supreme Court decision that is suggestive but not directly on point. Arizona is in the Ninth Circuit. No Arizona appellate court has addressed the issue.

Which statement accurately describes the authorities before the state court?

  1. The state court must follow the older U.S. Supreme Court decision even if distinguishable because it is from a higher court.
  2. The Ninth Circuit decision is binding on the state court because Arizona is within the Ninth Circuit and the issue is federal.
  3. U.S. Supreme Court decisions on federal law are binding on state courts; the Ninth Circuit decision is persuasive, not controlling, even though Arizona is within the Ninth Circuit. (correct answer)
  4. The state court may disregard both federal decisions because state courts decide federal claims independently of lower federal courts.
Explanation: When you see a state court applying federal law, remember the key hierarchy: the U.S. Supreme Court is the final authority on the meaning of the federal Constitution, and its decisions bind every state court. Lower federal courts—like the Ninth Circuit—are not in that vertical chain for state courts. State courts are not "in" a federal circuit for purposes of precedent; circuit splits are persuasive, not controlling, even when the state sits in that circuit. The correct statement is that U.S. Supreme Court decisions on federal law are binding on state courts; the Ninth Circuit decision is persuasive, not controlling, even though Arizona is within the Ninth Circuit. This is because the Supremacy Clause and the Constitution make the Supreme Court the ultimate arbiter of federal questions, while federal circuit opinions carry only persuasive weight in state tribunals. Now the wrong answers. "The state court must follow the older U.S. Supreme Court decision even if distinguishable" is wrong because a distinguishable precedent is not controlling—the court must determine whether the case actually governs, not blindly apply it. "The Ninth Circuit decision is binding on the state court because Arizona is within the Ninth Circuit" reflects the misconception that state courts are bound by the regional federal circuit; they are not. "The state court may disregard both federal decisions because state courts decide federal claims independently" confuses independent interpretation with ignoring Supreme Court authority; state courts cannot depart from binding Supreme Court precedent. Your takeaway: in federalism questions, distinguish vertical authority (Supreme Court binds everyone) from horizontal/persuasive authority (circuit courts and other states' courts merely guide state courts).

Question 10

The State Supreme Court, in Locke v. Burke, reversed a trial court's dismissal of a child-trespasser claim. The court held that a landowner owes a duty of reasonable care to a child who is attracted onto the property by a hazardous artificial condition. In a footnote the court wrote: 'Had the child been an adult trespasser, we would be inclined to apply the traditional rule that the landowner owes no duty except to refrain from willful and wanton misconduct.' A trial court later must decide a case involving an adult trespasser on similar facts.

What is the authoritative weight of the footnote in the later adult-trespasser case?

  1. It is dictum; the trial court may consider it persuasive, but it does not bind the court in the adult-trespasser case. (correct answer)
  2. It is an alternative holding that binds the trial court because the supreme court stated the governing rule for adult trespassers.
  3. It is binding because the court was defining the scope of the duty of care it had just recognized for all trespassers.
  4. It has no value at all because a footnote is never a part of a judicial opinion for purposes of precedent.
Explanation: When you see a question about the weight of a statement in a judicial opinion, your first job is to separate holding from dictum. A holding is the court's decision on the actual issues before it, based on the facts of the case. Dictum is commentary, illustration, or hypothetical discussion that is not necessary to the outcome. Here, the supreme court decided a child-trespasser case and announced the duty owed to children. The footnote about adult trespassers was purely hypothetical: the court said "had the child been an adult," it "would be inclined" to apply a different rule. That language signals speculation, not decision. Therefore, the footnote is dictum. The trial court in the later adult-trespasser case may find it persuasive, but it is not binding precedent. That is why the alternative-holding choice is wrong: an alternative holding must actually decide an issue, but the court did not decide anything about adult trespassers. Similarly, the choice claiming the footnote binds because the court defined the scope of duty for "all trespassers" misreads the opinion—the court's holding was explicitly limited to children, and the footnote undercuts rather than establishes a universal rule. Finally, the choice that a footnote has "no value at all" is too extreme; dictum, especially from a state supreme court, can be persuasive authority even though it lacks precedential force. On exam day, flag hypothetical language like "would be," "if," or "we are inclined"—that is the hallmark of dictum.

Question 11

A U.S. district judge in the Fourth Circuit is presiding over a diversity action governed by Virginia law. The Virginia Supreme Court has not decided whether a particular liquidated-damages clause is enforceable. In an earlier appeal from a different district court in the circuit, the Fourth Circuit, applying Virginia law, squarely held that such clauses are enforceable. A more recent, unreviewed decision of a Virginia circuit court held the opposite. The parties dispute which authority controls the district court.

Which statement best describes the authoritative weight of these authorities?

  1. The Fourth Circuit decision is binding on the district court, and the Virginia circuit court decision is not controlling; later Virginia Supreme Court authority or an en banc Fourth Circuit decision would be needed to displace it. (correct answer)
  2. The Virginia circuit court decision is binding under Erie because a federal court sitting in diversity must follow the most recent state court decision, even if that court is trial-level.
  3. The Fourth Circuit decision is only persuasive in the district court because it was predicting state law and the Virginia Supreme Court has not adopted it.
  4. The two decisions have equal persuasive weight because neither was issued by the Virginia Supreme Court and the two were decided one after the other.
Explanation: When you see a federal court applying state law in diversity, think about the two separate hierarchies at work: state court authority and federal circuit precedent. A federal district court is bound by its own circuit's decisions, even when that decision is merely predicting state law. So the Fourth Circuit's holding that liquidated-damages clauses are enforceable is binding on the district judge. The Virginia circuit court decision is a trial-level state ruling and does not control a federal court; it is at most persuasive evidence of state law. It cannot displace binding Fourth Circuit precedent. Only the Virginia Supreme Court—as the authoritative expositor of Virginia law—could definitively overrule the Fourth Circuit's prediction, and only an en banc Fourth Circuit decision could overrule the panel within the federal system. Why the others fail: The Virginia circuit court is not "binding under Erie" simply because it is the most recent state decision; Erie directs federal courts to follow the state's highest court, and lower-court decisions are not controlling. The Fourth Circuit decision is not "only persuasive" because federal circuit precedent binds district courts regardless of its predictive nature. And the two authorities do not have "equal persuasive weight": the Fourth Circuit decision carries mandatory authority for the district court, while the Virginia trial court is merely persuasive. On exam day, separate "binding on this federal court" from "authoritative on state law." Circuit precedent binds the district court; only the state's highest court can correct its interpretation.

Question 12

Ninth Circuit Rule 36-3 provides that an unpublished disposition 'is not precedent, except when relevant under the doctrines of law of the case, res judicata, and collateral estoppel.' In a diversity case pending in a federal district court in the Ninth Circuit, a party cites an unpublished 2021 Ninth Circuit disposition on a novel issue of state law. No published Ninth Circuit or Supreme Court decision has addressed the issue, and the state's highest court has not spoken.

How should the district court treat the unpublished disposition?

  1. It must disregard the unpublished disposition entirely because unpublished dispositions may not be cited in any subsequent case.
  2. It must follow the unpublished disposition as binding because Rule 36-3 permits citation of unpublished dispositions.
  3. It may consider the unpublished disposition as persuasive authority, but the disposition is not binding precedent in the district court. (correct answer)
  4. It must follow the unpublished disposition because it was issued by the court that has appellate jurisdiction over the district court.
Explanation: When you see a question about unpublished dispositions, separate two ideas: whether a case may be cited versus whether it is binding precedent. Under Ninth Circuit Rule 36-3, an unpublished disposition is not precedent except for law of the case, res judicata, or collateral estoppel. Here, the district court is sitting in diversity, so it must apply state substantive law. Since the state's highest court has not spoken and no published Ninth Circuit or Supreme Court decision addresses the issue, the unpublished 2021 disposition cannot control the outcome. The correct approach is to treat it as persuasive authority only. The court may find its reasoning helpful, but it is not bound to follow it. This also reflects Erie: federal courts deciding state-law issues should predict how the state's highest court would rule, not treat an unpublished federal disposition as controlling. The choice saying the court "must disregard" it entirely is wrong because unpublished dispositions can be cited; Rule 36-3 restricts their precedential effect, not their citability. The choice saying the court "must follow" it because Rule 36-3 permits citation confuses permission to cite with binding force. Likewise, the choice saying the court must follow it merely because the Ninth Circuit has appellate jurisdiction is wrong—appellate jurisdiction does not make an unpublished disposition binding precedent. Remember the trap: "citable" is not the same as "controlling." On bar questions, look for whether the authority is binding by rule or merely persuasive by reasoning.