Intermediate scrutiny
Intermediate scrutiny is a tier of judicial review in United States constitutional law, positioned between the highly demanding strict scrutiny and the deferential rational basis review, whereby courts assess whether government classifications or regulations—typically those involving quasi-suspect categories such as sex or illegitimacy, or content-neutral burdens on expressive freedoms—advance an important governmental objective through means substantially related to that objective.[1][2] This standard requires the government to demonstrate a closer fit between ends and means than under rational basis but does not demand narrow tailoring or the least restrictive alternative as in strict scrutiny.[1][3] The Supreme Court formalized intermediate scrutiny in Craig v. Boren (1976), invalidating an Oklahoma statute permitting females aged 18–20 to purchase low-alcohol beer while prohibiting males of the same age, on grounds that the gender-based distinction lacked sufficient relation to traffic safety objectives.[4][5] Since its inception, the doctrine has invalidated numerous sex-discriminatory laws while upholding others deemed substantially tied to biological differences or administrative efficiency, such as in parental citizenship transmission cases.[1][6] Critics contend the test's "substantial relation" prong invites subjective judicial balancing, yielding inconsistent outcomes across gender jurisprudence, with some advocating elevation to strict scrutiny given empirical evidence of persistent sex-based disparities uncorrelated to purported state interests.[7][8] Its application extends beyond equal protection to First Amendment contexts, like time-place-manner restrictions, where it balances regulatory aims against incidental speech encroachments without presuming unconstitutionality.[3][9]Definition and Framework
Core Elements of the Test
The intermediate scrutiny test, as articulated by the U.S. Supreme Court in Craig v. Boren (1976), evaluates whether a governmental classification—typically involving quasi-suspect categories such as sex or legitimacy—serves important governmental objectives and is substantially related to the achievement of those objectives.[4] This standard imposes a burden on the government to proffer evidence demonstrating both the significance of the interest and the efficacy of the means chosen, distinguishing it from deferential rational basis review.[1] The first core element requires an important governmental objective, which must transcend mere legitimacy or hypotheticals; it demands objectives rooted in real societal concerns, such as public safety or administrative efficiency, supported by legislative facts or empirical data rather than post-hoc rationalizations.[10] In Craig v. Boren, the Court accepted traffic safety as an important objective for an Oklahoma law restricting beer sales by age and gender but invalidated the statute for failing the second prong, emphasizing that the interest must be concretely tied to the classification's design.[5] Subsequent applications, such as in Mississippi University for Women v. Hogan (1982), have rejected objectives deemed pretextual or insufficiently weighty, like preserving single-sex education without evidence of unique benefits.[1] The second element mandates that the classification be substantially related to the objective, necessitating a persuasive evidentiary showing of a direct, non-arbitrary connection, often through statistical or empirical validation of the means-ends fit.[10] This prong tolerates some over- or under-inclusiveness but rejects classifications lacking a "fair and substantial relation," as in United States v. Virginia (1996), where the Court scrutinized the Virginia Military Institute's male-only admissions policy and found it failed due to inadequate justification for excluding women despite asserted leadership training goals.[11] Courts frequently demand data disproving less discriminatory alternatives or confirming the classification's necessity, with failure occurring when reliance on stereotypes or outdated assumptions undermines the relation, as evidenced by the 2-to-1 disparity in the Craig case's drunk driving statistics among young males versus females, which did not justify the gender line.[4]Comparison to Rational Basis and Strict Scrutiny
Intermediate scrutiny serves as an intermediate level of judicial review under the Equal Protection Clause of the Fourteenth Amendment, positioned between the highly deferential rational basis test and the demanding strict scrutiny standard. Rational basis review, the default for most legislative classifications, upholds laws that are rationally related to a legitimate governmental interest, with the burden on the challenger to disprove any conceivable rational connection, resulting in near-universal validity for economic or social welfare regulations.[12][13] In contrast, strict scrutiny applies to suspect classifications such as race or fundamental rights burdens, requiring the government to demonstrate a compelling interest and that the law is narrowly tailored to achieve it through the least restrictive means, often leading to invalidation absent extraordinary justification.[14] The intermediate standard, first articulated in Craig v. Boren (1976), demands that classifications based on quasi-suspect traits like gender advance an important governmental objective via means that are substantially related to that end, shifting the burden to the government to proffer evidence of fit while allowing some flexibility short of narrow tailoring.[1][5] This contrasts with rational basis's tolerance for underinclusiveness or overbreadth if any rational link exists, as seen in cases upholding age-based voting restrictions or economic regulations, where courts defer to legislative judgment without empirical demands.[12] Under intermediate scrutiny, however, the relation must be genuine and not rely on archaic stereotypes or unsubstantiated assumptions, as in Craig, where statistical evidence of traffic safety disparities was deemed insufficient to justify differential drinking ages by sex. Strict scrutiny, by comparison, prohibits even incidental overbreadth, mandating precision akin to a "scalpel" rather than a "sledgehammer," as in race-based affirmative action cases requiring exhaustive alternatives analysis.[5][14]| Scrutiny Level | Required Governmental Interest | Means-End Relationship | Burden of Proof | Typical Outcome Rate |
|---|---|---|---|---|
| Rational Basis | Legitimate | Rationally related | On challenger (deferential) | Upheld in ~99% of cases[12] |
| Intermediate | Important | Substantially related | On government (moderate) | Mixed, ~50-70% upheld in gender cases[1] |
| Strict | Compelling | Narrowly tailored/least restrictive | On government (heavy presumption against) | Struck down in majority of applications[14] |