Incorporation Doctrine: How the Bill of Rights Applies to States

The incorporation doctrine determines which protections in the federal Bill of Rights constrain state and local governments, not just the federal government. Without this doctrine, the First, Fourth, Fifth, Sixth, and Eighth Amendments would operate only against federal actors, leaving state legislatures and law enforcement outside their reach. This page covers the constitutional basis for incorporation, the mechanics of selective and total incorporation, the landmark cases that built the doctrine case by case, and the persistent tensions that make it one of the most contested areas of constitutional law.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps (non-advisory)
• Reference table or matrix

Definition and scope

The Bill of Rights — the first 10 amendments to the U.S. Constitution, ratified in 1791 — was written to constrain the federal government. The Supreme Court confirmed this limitation in Barron v. Baltimore, 32 U.S. 243 (1833), holding that the Fifth Amendment's Takings Clause did not apply to a municipal city's destruction of a wharf owner's property (Justia, Barron v. Baltimore). That ruling effectively placed state actors beyond the reach of the Bill of Rights for the next 35 years.

The ratification of the Fourteenth Amendment in 1868 created the constitutional vehicle for change. Section 1 of the Fourteenth Amendment prohibits states from abridging "the privileges or immunities of citizens of the United States," depriving persons of "life, liberty, or property, without due process of law," or denying "the equal protection of the laws" (U.S. Constitution, Amendment XIV, §1). The incorporation doctrine is the judicial interpretation that reads certain Bill of Rights guarantees into the word "liberty" in the Fourteenth Amendment's Due Process Clause, thereby making those guarantees enforceable against state governments.

The full scope of incorporation was not announced in a single ruling. Instead, the Supreme Court built the doctrine incrementally across more than 130 years of decisions, incorporating rights one by one through a process scholars call selective incorporation. As of the Supreme Court's decision in McDonald v. City of Chicago, 561 U.S. 742 (2010), nearly every provision of the Bill of Rights has been incorporated against the states, with a small set of exceptions that remain unresolved (Oyez, McDonald v. City of Chicago).

Core mechanics or structure

Two theoretical frameworks have competed to explain how incorporation works.

Privileges or Immunities Clause incorporation — argued by Justice Hugo Black and originally advanced in the dissent of Adamson v. California, 332 U.S. 46 (1947) — holds that the Privileges or Immunities Clause of the Fourteenth Amendment was intended to make the entire Bill of Rights applicable to the states wholesale. This approach, known as "total incorporation," was never adopted by a Court majority, in part because the Court had already gutted the Privileges or Immunities Clause in The Slaughterhouse Cases, 83 U.S. 36 (1873) (Oyez, The Slaughterhouse Cases).

Due Process Clause selective incorporation — the approach that prevailed — holds that only those rights that are "fundamental to the American scheme of justice" or "deeply rooted in this Nation's history and tradition" are incorporated through the Due Process Clause of the Fourteenth Amendment. The Court articulated this standard most clearly in Duncan v. Louisiana, 391 U.S. 145 (1968), which incorporated the Sixth Amendment right to a jury trial in serious criminal cases (Oyez, Duncan v. Louisiana).

The practical mechanics operate as follows:

1. A state or local government action burdens a claimed right.
2. The litigant argues that the right derives from one of the first 8 amendments (the 9th and 10th amendments raise distinct structural questions and are not subject to incorporation in the traditional sense).
3. The Court asks whether the right is fundamental to ordered liberty.
4. If fundamental, the right is incorporated and applies to the states with the same force it applies to the federal government.
5. The incorporated right is then subject to the same tiers of scrutiny — including strict scrutiny — that govern its federal application.

Causal relationships or drivers

Three historical forces drove the development of incorporation doctrine.

Post-Civil War constitutional revision. The Reconstruction Amendments — the Thirteenth, Fourteenth, and Fifteenth — were designed to restructure the relationship between federal authority and the states in the wake of slavery. The Fourteenth Amendment's drafters, particularly Representative John Bingham of Ohio, intended Section 1 to override Barron v. Baltimore and extend federal constitutional protections against state action. Congressional debates from 1866, preserved in the Congressional Globe, show explicit references to applying Bill of Rights protections to freedmen in Southern states.

State criminal procedure abuses. A series of state criminal cases in the early 20th century provided the factual backdrop for incorporation. In Powell v. Alabama, 287 U.S. 45 (1932), the Court reversed the convictions of the Scottsboro defendants after Alabama denied them effective counsel in a capital case, finding a due process violation (Oyez, Powell v. Alabama). These cases demonstrated the concrete harm that could result when states operated without federal constitutional constraints.

Warren Court activism (1953–1969). The greatest expansion of incorporation occurred during Chief Justice Earl Warren's tenure. Mapp v. Ohio, 367 U.S. 643 (1961), incorporated the Fourth Amendment's exclusionary rule (Oyez, Mapp v. Ohio). Gideon v. Wainwright, 372 U.S. 335 (1963), incorporated the Sixth Amendment right to counsel (Oyez, Gideon v. Wainwright). Miranda v. Arizona, 384 U.S. 436 (1966), extended Fifth Amendment self-incrimination protections to custodial interrogations conducted by state officers, shaping what became known as Miranda rights.

Classification boundaries

Not every Bill of Rights provision occupies the same status under incorporation doctrine. Three categories exist:

Fully incorporated rights — These apply to states with the same force as to the federal government. The set includes the First Amendment (speech, religion, press, assembly, and petition), the Fourth Amendment (search and seizure), the Fifth Amendment (double jeopardy and self-incrimination, though not the grand jury indictment requirement), the Sixth Amendment (speedy trial, public trial, jury trial in serious cases, confrontation, compulsory process, and counsel), and the Eighth Amendment (cruel and unusual punishment). The Fourteenth Amendment rights to due process and equal protection apply directly to states by their own text, not through incorporation.

Partially incorporated rights — The Second Amendment's individual right to keep and bear arms was incorporated in McDonald v. City of Chicago (2010), though the precise contours of what regulations are permissible against state and local governments remain contested following New York State Rifle & Pistol Association v. Bruen, 597 U.S. 1 (2022) (Oyez, Bruen).

Unincorporated provisions — The Third Amendment (quartering of soldiers), the Seventh Amendment (civil jury trial in suits at common law), and the Fifth Amendment's requirement of grand jury indictment have never been formally incorporated by the Supreme Court. The Excessive Fines Clause of the Eighth Amendment was incorporated as recently as Timbs v. Indiana, 586 U.S. 146 (2019) (Oyez, Timbs v. Indiana), illustrating that incorporation remains an ongoing process rather than a closed set.

Tradeoffs and tensions

Federalism vs. uniform rights floors. Incorporation constrains state autonomy. States retain broad police powers under the Tenth Amendment, but once a right is incorporated, state legislatures cannot fall below the federal constitutional floor. Critics of aggressive incorporation argue it displaces democratic experimentation at the state level; defenders counter that uniform rights floors prevent a race to the bottom in civil liberties protection.

Jot-for-jot vs. calibrated application. A contested doctrinal question is whether an incorporated right applies to states with identical force as to the federal government ("jot-for-jot" incorporation) or whether states retain some flexibility. The Court addressed this in Williams v. Florida, 399 U.S. 78 (1970), holding that the Sixth Amendment jury trial right incorporated against states did not require a 12-person jury, since the underlying functional right — jury participation in criminal adjudication — was satisfied by a 6-person panel (Oyez, Williams v. Florida). That holding was partially reversed for serious criminal cases in subsequent decisions, illustrating the instability of calibrated incorporation.

Historical originalism and unenumerated rights. The framework from McDonald relied on the substantive due process tradition, which has faced renewed challenge from originalist justices who favor the Privileges or Immunities Clause as the proper vehicle for incorporation. Justice Clarence Thomas, in his McDonald concurrence, argued that the Second Amendment should be incorporated through Privileges or Immunities, not Due Process. This disagreement about the correct constitutional home for incorporation has downstream consequences for rights not yet formally incorporated, including those related to due process rights more broadly.

Common misconceptions

Misconception: The Bill of Rights has always applied to the states.
Correction: The Supreme Court held explicitly in Barron v. Baltimore (1833) that the Bill of Rights restrained only the federal government. Selective incorporation of individual rights against the states did not begin until Chicago, Burlington & Quincy Railroad Co. v. City of Chicago, 166 U.S. 226 (1897), which incorporated the Takings Clause, and accelerated dramatically only after 1925.

Misconception: All 10 amendments of the Bill of Rights are now incorporated.
Correction: The Third, Seventh, and parts of the Fifth Amendment have not been formally incorporated by the Supreme Court. Grand jury indictment, in particular, remains a federal-only requirement, meaning state felony prosecutions may proceed by prosecutor's information rather than grand jury.

Misconception: Incorporation applies to private actors.
Correction: Incorporation extends the Bill of Rights only to government actors — federal, state, and local. Private employers, private schools, and private property owners are not bound by the First or Fourth Amendments through incorporation doctrine. Private-sector constitutional-style protections, where they exist, derive from statutes or state constitutions, not federal incorporation. This distinction is central to understanding civil rights vs. constitutional rights.

Misconception: The Fourteenth Amendment's equal protection clause is itself an incorporated right.
Correction: Equal protection and due process apply to states directly through the text of the Fourteenth Amendment — they do not require incorporation because they were written specifically to constrain states, not the federal government.

Misconception: Incorporation makes all incorporated rights absolute.
Correction: Incorporation determines that a right applies to states; it says nothing about the weight of that right against competing government interests. An incorporated right is still subject to scrutiny review. The First Amendment rights applicable to states, for example, permit time, place, and manner regulations that survive intermediate or strict scrutiny.

Checklist or steps (non-advisory)

The following sequence describes the analytical steps a court follows when resolving whether a Bill of Rights provision limits a state government action:

Step 1 — Identify the claimed right.
Determine which specific provision of Amendments 1 through 8 is at issue and articulate the precise protection it affords at the federal level.

Step 2 — Confirm the state actor requirement.
Confirm that the challenged action was taken by a state, local government, or governmental official, not a private party.

Step 3 — Check existing incorporation precedent.
Search the Supreme Court's precedent for a prior holding that the specific provision is — or is not — incorporated. Cornell Law's Legal Information Institute and the Constitution Annotated (Constitution Annotated, Congress.gov) maintain updated summaries of incorporation status for each provision.

Step 4 — Apply the Duncan / McDonald fundamental rights test if no precedent exists.
Ask whether the right is "fundamental to the American scheme of justice" or "deeply rooted in this Nation's history and tradition and implicit in the concept of ordered liberty" (McDonald, citing Washington v. Glucksberg, 521 U.S. 702 (1997)).

Step 5 — Determine scope of the incorporated right against the state.
Assess whether the Court has applied the right jot-for-jot to states or permitted modified application (as in Williams v. Florida for jury size).

Step 6 — Apply the appropriate level of scrutiny.
Match the substantive claim to the correct standard — strict scrutiny, intermediate scrutiny, or rational basis review — and evaluate whether the state action survives. Details on the strict scrutiny framework appear in the strict scrutiny standard reference.

Step 7 — Assess available remedies.
If a state actor violated an incorporated right, identify available remedies, which may include 42 U.S.C. § 1983 claims (42 U.S.C. § 1983), suppression of evidence, or habeas corpus relief. The section 1983 civil rights claims framework governs most civil damage actions against state officials.

Reference table or matrix

The table below summarizes the incorporation status of each of the first 8 amendments, the key case, and the year incorporated. For constitutional rights covered across the site, the constitutional rights overview at constitutionalrightsauthority.com provides a navigational index to each right.