Hecox v. Little, 479 F.Supp.3d 930

Idaho enacted HB 500, the Fairness in Women’s Sports Act, designating athletic teams by biological sex and barring transgender women from female teams.
The Act creates a dispute process to verify a student’s biological sex and authorizes an implied private right of action against schools for violations.
Enforcement risks include potential invasive sex-verification examinations and civil liability for schools that allow transgender athletes to participate in female teams.
Plaintiffs challenge the Act on equal protection grounds (and others pled), seeking a preliminary injunction to halt enforcement pending merits.
The court also considers intervention by proposed intervenors (cisgender female athletes) and the United States’ interest, and analyzes standing and ripeness prior to ruling on the injunction.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Intervention right	Intervenors lack cognizable interests or adequate representation	Intervenors’ interests align with defending the Act and federal/state interests	Intervention granted (as of right) and permissive intervention appropriate
Standing and ripeness	Lindsay and Jane suffer injury-in-fact from the Act’s impact on participation and privacy	Injuries are speculative or contingent on future enforcement	Lindsay and Jane have injury-in-fact; claims ripe; facial challenges dismissed at this stage while as-applied claims proceed
Facial vs as-applied challenges	Act violates equal protection on its face	Salerno standard governs facial challenges; Act potentially constitutional in some applications	Facial Fourteenth Amendment challenges dismissed; as-applied challenges retained for merits
Preliminary injunction likelihood of success	Act unconstitutionally discriminates based on transgender status/sex, harming rights and opportunities	Act serves important objectives and is substantially related to those ends	Preliminary injunction granted; likelihood of success on merits; irreparable harm and equities favor restraint

Lujan v. Defenders of Wildlife, 504 U.S. 555 (1992) (standing requires injury, causation, redressability)
Spokeo, Inc. v. Robins, 136 S. Ct. 1540 (2016) (injury-in-fact must be concrete and particularized)
Latta v. Otter, 771 F.3d 456 (9th Cir. 2014) (heightened scrutiny for transgender classifications (quasi-suspect) and state interest in sex-segregation)
Karnoski v. Trump, 926 F.3d 1180 (9th Cir. 2019) (transgender status triggers heightened scrutiny)
Craig v. Boren, 429 U.S. 190 (1976) (heightened scrutiny for sex-based classifications)
United States v. Virginia, 518 U.S. 515 (1996) (sex classifications require substantial relation to important objectives)
Clark v. Jeter, 486 U.S. 462 (1988) (sex-based exclusions may be permissible where justified by gender differences)
Salerno v. United States, 481 U.S. 739 (1987) (no set of circumstances test for facial challenges (Salerno standard))
City of Los Angeles v. Patel, 576 U.S. 409 (2015) (limits of Salerno approach; population-focused analysis for facial challenges)
Romer v. Evans, 517 U.S. 620 (1996) (strikes down laws that demean a protected class)
Bostock v. Clayton County, 140 S. Ct. 1731 (2020) (transgender status protected by sex discrimination framework)