Parents of student athletes, TransFamilies, and the Washington Education Association are suing in state court to block Initiative 638, which Washington voters passed this month and which bans transgender girls from women's teams — from elementary through high school — and requires girls to document their sex via hormone or genetic tests or exams of their reproductive anatomy before joining. The suit, backed by the ACLU of Washington and Legal Voice, argues the measure violates the state constitution's privacy and equal-rights protections, and parents and advocates warn it would force "invasive" genital exams and drive girls out of sports; proponents say it protects fairness.