West Virginia v. B. P. J. · ¶81

Based on all of the above, the States argue—and we agree—that the interests in safety and competitive fairness are important for purposes of equal protection analysis. And the States’ sex-based classification—limiting women’s and girls’ sports to biological females—is substantially related to those interests. See Skrmetti, 605 U. S., at 510; Tuan Anh Nguyen v. INS, 533 U. S. 53, 70 (2001); Michael M. v. Superior Court, Sonoma Cty., 450 U. S. 464, 472–473 (1981) (plurality opinion). Therefore, schools may maintain women’s and girls’ sports for biological females. In other words, schools may determine eligibility for women’s and girls’ sports based on biological sex.

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