Lawmakers in Idaho have argued that allowing transgender athletes on girls’ and women’s teams would negate nearly 50 years of progress women have made since the 1972 federal legislation credited with opening up sports to female athletes.
The state's law prohibits transgender students who identify as female from playing on female teams sponsored by public schools, colleges and universities. It does not apply to men’s teams.
The American Civil Liberties Union and Legal Voice women’s rights group sued last year over the Idaho law, contending it violates the 14th Amendment’s Equal Protection Clause because it is discriminatory.
A federal judge temporarily blocked the law from taking effect, and Idaho appealed in September.