Louisiana has become the 18th state to enact a trans athlete ban. The measure to bar trans girls and women from competing on school sports teams became law after the state’s Democratic governor, John Bel Edwards, chose not to veto the legislation. The bill, called the Fairness in Women’s Sports Act, says that schools must designate teams based on “biological sex” — defined as the sex listed on a person’s birth certificate at the time of their birth.