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The Modes of Constitutional Analysis:
Judicial Precedent (Part 4)
December 30, 2021
This Legal Sidebar Post is the fourth in a nine-part series that discusses certain methods or modes of
analysis that the Supreme Court has employed to determine the meaning of a provision within the
Constitution. (For additional background on this topic and citations to relevant sources, please see CRS
Report R45 129, Modes of Constitutional Interpretation)
The Supreme Court's prior decisions on questions of constitutional law are the most commonly cited
source of the Constitution's meaning. For most Justices, if not all, judicial precedent provides possible
principles, rules, or standards to govern judicial decisions in future cases with arguably similar facts.
Although the Court routinely purports to rely upon precedent, it is unclear how often precedent has
actually constrained the Court's decisions because the Justices have latitude in how broadly or narrowly
they choose to construe their prior decisions.
In some cases, however, a single precedent may play a particularly prominent role in the Court's
decisionmaking. For example, a plurality of Justices relied on Roe v. Wade as controlling precedent in
their opinion in Planned Parenthood v Casey. In that case, the plurality reaffirmed Roe's holding that a
woman has a protected liberty interest in terminating her pregnancy prior to fetal viability, stating that the
essential holding of Roe should be retained. Another example of the heightened role that precedent can
play in constitutional interpretation is the Court's decision in Dickerson v United States. That case
addressed the constitutionality of a federal statute governing the admissibility of statements made during
police interrogation, a law that functionally would have overruled the Court's 1966 case Miranda v.
Arizona. In striking down the statute, the majority declined to overrule Miranda, noting that the 1966 case
had become embedded in routine police practice to the point where the warnings have become part of
our national culture.
More often, the Court reasons from the logic of several precedents in rendering its decisions. An example
is Arizona State Legislature v Arizona Independent Redistricting Commission, which held that the voters
of Arizona could remove from the state legislature the authority to redraw the boundaries for legislative
districts and vest that authority in an independent commission. In so holding, the Court examined the
Elections Clause, which states that the Times, Places, and Manner of holding Elections for Senators and
Representatives, shall be prescribed in each State by the Legislature thereof. The Court determined that
the term Legislature encompassed the voters of a state making law through a referendum. In reaching
Congressional Research Service
https://crsreports.congress.gov
LSB10678
CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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