Levels of Scrutiny, Explained: The Framework Behind Every Constitutional Law Exam Question
If you've sat through a Constitutional Law course, you already know the feeling: a fact pattern lands on the exam, and the entire answer hinges on one threshold call you have to make in the first thirty seconds - which level of scrutiny applies? Get that call right and the rest of the analysis mostly writes itself. Get it wrong and no amount of good writing saves the answer, because you'll be applying the wrong test to the right facts.
This isn't just an exam-skills problem. The Supreme Court's own 2024-25 term turned repeatedly on exactly this question, in cases decided this past year. Below is the framework - the three tiers, how to identify which one applies, and how the Court actually used them recently - built the way you'd want it explained the week before an exam.
The Three Tiers, Defined
Since the Supreme Court's 1937 "footnote four" in United States v. Carolene Products, constitutional analysis of individual liberties and equal protection claims has run through three tiers of scrutiny:
Rational basis review is the default, lowest tier. A government action is upheld so long as it is rationally related to a legitimate government interest. The court gives enormous deference to the political process - it doesn't matter whether the government's actual purpose was the one it claims, only whether any conceivable legitimate purpose supports the law. Under this tier, the challenger carries the burden, and the government almost always wins.
Intermediate scrutiny sits in the middle. It requires the government to show its action is substantially related to an important government interest. This tier has traditionally applied to classifications based on sex or gender. Critically, intermediate scrutiny does not require the government to use the least restrictive means available - a materially lower bar than strict scrutiny.
Strict scrutiny is the top tier, applied when a fundamental right is burdened or when the government discriminates based on a suspect classification (race, national origin, religion, alienage). Here the burden shifts to the government, which must prove its action is necessary to achieve a compelling interest - meaning no less restrictive alternative would work. Professor Gerald Gunther's 1972 description still holds: strict scrutiny is "strict in theory, but fatal in fact." The government usually loses, though not always - the Court has upheld laws under strict scrutiny in cases like Holder v. Humanitarian Law Project (2010), Burson v. Freeman (upholding a ban on electioneering within 100 feet of a polling place), and Williams-Yulee v. Florida Bar (upholding a rule barring judicial candidates from personally soliciting campaign funds).
How to Identify Which Tier Applies (an IRAC Approach)
For US exam-takers, running this through an IRAC structure keeps the analysis disciplined:
Issue: What right is burdened, or what classification is the government drawing?
Rule: Match the right/classification to its tier. Race, national origin, religion, and fundamental rights (voting, interstate travel, marriage, certain privacy rights) trigger strict scrutiny. Sex and gender classifications trigger intermediate scrutiny. Everything else - economic regulation, general social-welfare legislation - gets rational basis.
Application: Apply that tier's specific test to the facts. This is where most points are won or lost: don't blend the tests. "Important" (intermediate) and "compelling" (strict) are not interchangeable words, and "substantially related" (intermediate) is a materially different standard from "necessary" (strict, which requires least-restrictive-means analysis that intermediate scrutiny does not).
Conclusion: State the outcome and, if it's a close call, note which way the tier choice cuts the result - because in scrutiny-tier analysis, the tier chosen is very often outcome-determinative.
The 2024-25 Term in Action
Two decisions from the Court's most recently concluded term show how much weight the tier choice carries in practice.
In United States v. Skrmetti, the Court considered a Tennessee law restricting certain medical treatments for transgender minors. Chief Justice Roberts's majority opinion applied rational basis review, concluding the law did not discriminate based on sex or gender identity, and upheld it - explicitly leaving the policy question "to the people, their elected representatives, and the democratic process." Justice Sotomayor's dissent argued the law was sex-based discrimination requiring intermediate scrutiny, under which she believed Tennessee could not show its law was substantially related to an important interest given the medical evidence in the record. Three justices wrote separately to argue that gender-identity classifications should never receive more than rational basis review going forward.
In Free Speech Coalition v. Paxton, the Court upheld a Texas law requiring age verification on websites where more than a third of the content is sexually explicit. Justice Thomas's majority opinion (6-3) applied intermediate scrutiny, reasoning that any burden on adults' access was merely incidental to regulating content unprotected by the First Amendment for minors - and because intermediate scrutiny doesn't require the least restrictive alternative, Texas didn't have to prove no better-tailored law existed. Justice Kagan's dissent argued strict scrutiny should have applied because the law was a content-based speech restriction, and that Texas should have had to adopt a less restrictive alternative if one existed.
Read together, the two cases are a clean illustration of the same lesson: the tier chosen decided the outcome in each, independent of how sympathetic or unsympathetic the underlying facts were to either side.
The Second Amendment Exception
One doctrinal wrinkle worth knowing: the tiers-of-scrutiny framework doesn't govern everywhere. In New York State Rifle & Pistol Association v. Bruen (2022), the Court expressly rejected using scrutiny tiers to evaluate Second Amendment gun regulations, holding instead that a regulation is constitutional only if consistent with the nation's historical tradition of firearm regulation. There has been some speculation - including from Justice Thomas's opinion in Vidal v. Elster (2024), a trademark/First Amendment case - that this history-and-tradition approach might spread to other areas of individual-rights doctrine. So far, a majority of the Court, including Justice Barrett in Vidal, has resisted that move outside the Second Amendment context, and the 2024-25 term's cases (Skrmetti, Paxton, and religion cases like Catholic Charities Bureau v. Wisconsin Labor & Industry Review Commission and Mahmoud v. Taylor, both decided under strict scrutiny) confirm the traditional tiers are still doing the analytical work everywhere else.
Exam Checklist: Applying the Right Tier in Four Steps
- Name the right or classification precisely before you name the tier - vague issue-spotting ("this seems unfair") won't get you to the correct test.
- State the tier's specific test in full, including the burden of proof and (for strict scrutiny) the least-restrictive-means requirement - partial recitations lose points even with the right conclusion.
- Apply the test to the facts you're given, not to a hypothetical stronger or weaker version of them - examiners build fact patterns specifically to test tier-application discipline.
- Flag genuine doctrinal uncertainty (e.g., what tier applies to gender-identity classifications after Skrmetti left the question open) rather than picking a tier and hiding the ambiguity - showing you know where the law is unsettled is itself a strong answer.
Where This Fits Into Your Prep
The scrutiny-tier framework rewards students who can hold structure and precision under time pressure - which is exactly what a model answer or an exam-technique session is built to sharpen. If you're mapping this framework onto your own outline or a practice fact pattern and want feedback on where your structure or precision could tighten up, that's the kind of session-based, exam-technique coaching LexWriters' tutoring and model-essay work is designed around - not writing the answer for you, but helping you see where your own analysis is landing short.
Sources
- Erwin Chemerinsky, The levels of scrutiny are here to stay (for now at least), SCOTUSblog, Aug. 14, 2025 (primary source for the Skrmetti, Paxton, Vidal v. Elster, Bruen, Catholic Charities, and Mahmoud v. Taylor case summaries, and the Gunther "strict in theory, fatal in fact" citation).
- Cornell Law School Legal Information Institute, Wex, "Strict Scrutiny" (tier definitions).
- United States v. Carolene Products Co., 304 U.S. 144 (1938) (origin of tiered scrutiny via footnote four).
- New York State Rifle & Pistol Association v. Bruen, 597 U.S. 1 (2022) (Second Amendment history-and-tradition test).