Substantive Due Process and Fundamental Rights
Key Takeaways
- Substantive due process protects certain rights so fundamental that government may not infringe them regardless of procedures; the test depends on whether the right is 'fundamental.'
- Infringements on fundamental rights (marriage, procreation, contraception, family relations, parental control, travel, voting, privacy) trigger strict scrutiny: the law must be necessary to a compelling government interest.
- Non-fundamental rights, including economic regulation, get rational-basis review: upheld if rationally related to any legitimate government interest.
- Obergefell v. Hodges (2015) recognized a fundamental right to same-sex marriage; Dobbs v. Jackson (2022) overruled Roe, holding abortion is not a fundamental right and is reviewed under rational basis.
- The 'right to die' is limited: a competent person may refuse unwanted medical treatment, but there is no fundamental right to physician-assisted suicide (Glucksberg; Cruzan).
The Two-Tier Structure of Substantive Due Process
Substantive due process (under the Fifth and Fourteenth Amendment Due Process Clauses) asks not how the government acted but whether it may act at all. The level of scrutiny turns entirely on whether the asserted right is fundamental.
| Type of Right | Scrutiny | Standard | Burden |
|---|---|---|---|
| Fundamental right | Strict scrutiny | Law must be necessary to achieve a compelling government interest (narrowly tailored, least restrictive means) | Government |
| Non-fundamental right (incl. economic/social welfare) | Rational basis | Law must be rationally related to a legitimate government interest | Challenger |
Under rational basis, the law is presumed valid and will be upheld so long as any conceivable legitimate purpose supports it; the government need not have actually relied on that purpose. This is why nearly all economic regulation survives — the Lochner era of aggressive judicial review of economic legislation is long dead (Williamson v. Lee Optical). Under strict scrutiny, the presumption flips: the law is presumptively invalid and rarely survives.
The central skill is identifying the right and pinning the correct tier. The Supreme Court is reluctant to recognize new fundamental rights; under Washington v. Glucksberg (1997), a fundamental right must be 'deeply rooted in this Nation's history and tradition' and 'implicit in the concept of ordered liberty.' Dobbs (2022) re-emphasized that history-and-tradition test.
The Catalog of Fundamental Rights
The recognized fundamental rights under substantive due process (the 'privacy' line, plus a few others) include:
- Marriage — the right to marry, including same-sex marriage (Loving v. Virginia; Obergefell v. Hodges (2015)).
- Procreation — freedom from compelled sterilization (Skinner v. Oklahoma).
- Contraception — the right to obtain and use contraceptives (Griswold v. Connecticut; Eisenstadt v. Baird).
- Family relations and living with relatives (Moore v. East Cleveland).
- Parental rights to direct the upbringing and education of one's children (Meyer v. Nebraska; Pierce v. Society of Sisters; Troxel v. Granville).
- Private consensual intimate conduct (Lawrence v. Texas).
- Interstate travel and voting (often analyzed under both due process and equal protection).
- Refusal of unwanted medical treatment by a competent adult (Cruzan v. Director recognized the liberty interest; a state may require clear and convincing evidence of the patient's wishes).
Notably NOT fundamental: physician-assisted suicide (Glucksberg — rational basis), and, after Dobbs v. Jackson Women's Health Organization (2022), abortion, which overruled Roe v. Wade and Casey and returned the issue to the political process under rational-basis review. Education is not a fundamental right (San Antonio v. Rodriguez), nor are food, shelter, or government welfare. An MBE trap: do not reflexively apply strict scrutiny to a sympathetic interest — confirm it appears on the recognized list before escalating the tier.
A state passes a law prohibiting anyone from operating an eyeglass-frame fitting business unless licensed by an optometrist, citing consumer protection. A frame fitter challenges the law as a due process violation. What standard applies and what is the likely result?
Applying Strict Scrutiny and Modern Developments
When a fundamental right is directly and substantially burdened, apply strict scrutiny: the government must show the law is necessary — the least restrictive means — to serve a compelling interest. A law that merely makes the exercise of a right somewhat more difficult, without substantially burdening it, may escape strict scrutiny. For example, reasonable regulation of the time, place, and manner of marriage licensing does not infringe the fundamental right.
Obergefell v. Hodges held that the fundamental right to marry extends to same-sex couples under both the Due Process and Equal Protection Clauses, invalidating state bans. Lawrence v. Texas struck a law criminalizing same-sex intimacy, recognizing a liberty interest in private consensual conduct, though the Court applied a less clearly labeled standard than pure strict scrutiny.
Dobbs (2022) is the pivotal recent change: holding that the Constitution does not confer a right to abortion, it overruled Roe and Casey and subjected abortion regulation to rational-basis review, returning the question to the states.
For the bar, treat abortion as not a fundamental federal right post-Dobbs while continuing to recognize contraception, marriage, family, and parental rights as fundamental. Finally, distinguish substantive due process from equal protection: due process is the right tool when a law denies a right to everyone; equal protection applies when a law grants the right to some but denies it to others. On essays, when a single fact pattern burdens a fundamental right selectively, analyze it under both clauses.
A state enacts a law banning all use of contraceptives by married couples, asserting an interest in promoting larger families. Under current doctrine, how should a court evaluate this law?
Incorporation and the Relationship to Other Clauses
Substantive due process is also the vehicle for incorporation — the doctrine by which most Bill of Rights guarantees apply against the states through the Fourteenth Amendment's Due Process Clause. Nearly all of the first eight amendments are incorporated; the principal exceptions historically were the Third Amendment, the Fifth Amendment grand-jury requirement, the Seventh Amendment civil-jury right, and the Eighth Amendment excessive-fines clause — though Timbs v. Indiana (2019) incorporated the excessive-fines clause, and McDonald v. City of Chicago (2010) incorporated the Second Amendment right to keep and bear arms.
Knowing that the substantive component of due process carries the Bill of Rights to the states helps you spot when a state law is being challenged under, say, the Free Speech or Free Exercise Clause.
When organizing a substantive due process essay, move briskly through four steps: (1) identify the asserted right and decide whether it is on the recognized fundamental-rights list (marriage, procreation, contraception, family/parental relations, private intimacy, travel, voting, refusal of treatment); (2) select the tier — strict scrutiny for fundamental rights, rational basis for everything else, including all economic regulation; (3) state the standard verbatim and assign the burden to the correct party; and (4) apply it, watching for whether the burden is direct and substantial enough to count as an infringement.
Reserve a sentence to distinguish equal protection: if the law withholds a right from some people but grants it to others, frame the issue under equal protection (or under both clauses, as Obergefell did with same-sex marriage).