You know the three tiers. The hardest step in practice comes first: deciding which tier applies. The answer depends on what the law classifies (for equal protection) or what right it burdens (for due process and specific rights), not on how fair or unfair the law seems.
| Law classifies by or burdens… | Tier | Example cases |
|---|---|---|
| Race or national origin | Strict | Korematsu (1944), Loving (1967), Adarand (1995) |
| A fundamental right (voting, interstate travel, marriage; speech based on content) | Strict | Harper (1966), Reed v. Town of Gilbert (2015) |
| Sex | Intermediate | Craig v. Boren (1976), United States v. Virginia (1996) |
| Birth outside marriage (legitimacy) | Intermediate | Clark v. Jeter (1988) |
| Age, disability, wealth, most economic and social distinctions | Rational basis | Cleburne (1985), Lee Optical (1955) |
Why it works
Key idea
Worked example: Sorting three laws
- (a) Age: rational basis.
- (b) Race: strict scrutiny, even though the program is meant to help (Croson, 1989; Adarand, 1995).
- (c) Sex: intermediate scrutiny, with an exceedingly persuasive justification required.
Answer: (a) rational basis, (b) strict, (c) intermediate.
Worked example: When the tiers do not apply
- The claim is not that the law classifies anyone or burdens a fundamental right; it is about what procedures are owed before the government takes away a benefit.
- For that question the Court uses the balance from Mathews v. Eldridge (1976): the private interest at stake, the risk of error under the current procedures and the value of more safeguards, and the government's interest, including cost.
- In Mathews itself, the Court held that a hearing after the benefits stopped was enough.
Answer: A balancing test, not a tier.
Common mistake
Justices disagree about the framework itself. Some argue the tiers are judge-made and should give way to text and history in more areas; others argue that history-based tests are hard to apply and that the tiers give needed structure. Practice here asks which test applies, not which approach is better. The framework continues in Constitutional Law II, including the Second Amendment and the Establishment Clause tests.