Idaho Gov. Little signed HB 421, defining sex and gender as binary biological categories across state code
Idaho Gov. Brad Little signed House Bill 421 on April 9, 2024, inserting binary biology-based definitions of "sex," "male," "female," and "gender" into Idaho Code section 73-114, the general statutory-terms section that applies by default across all state statutes unless a specific law defines otherwise. The law declares there are "two, and only two, sexes," fixes sex at conception or birth rather than self-identification, defines "gender" as a synonym for biological sex that explicitly excludes gender identity, and amends Idaho's birth-certificate, vulnerable-child, and school changing-facility statutes to point to the new definition. It passed the House 54-14 and the Senate 26-8 and took effect as Session Law Chapter 322 on July 1, 2024.