Nearly a year after it passed the Legislature, Gov. Greg Gianforte signed a bill Tuesday defining sex as binary, based on a person’s reproductive system. The move officially amends wide ranging sections of Montana law to include new definitions of “male,” “female,” “sex,” and “gender.” Senate Bill 437 is largely similar to a 2023 law that was declared unconstitutional twice — first in June 2024, because its subject wasn’t clear in its title, and second in February 2025 because a judge found it