Alaska's state board of education voted to ban males who believe they are female from competing on girls' high school sports teams, with legislation stating the athletes must be born female.
The state board voted on an amendment that stated it "ensures fairness, safety, and equal opportunity for female students in high school athletics."
"If a separate high school athletics team is established for female students, participation shall be limited to females who were assigned female at birth," the rule added.
The new regulation would apply to all schools and districts that join the Alaska School Activities Association, the regulating body for high school sports in the state, the Hill reported.