MO SB1389

Creates a private cause of action against businesses that have policies allowing individuals to enter restrooms or changing facilities designated for the opposite biological sex, where another person's privacy is violated

Defines "biological sex" based on chromosomes, hormones, anatomy, and birth certificate, explicitly excluding gender identity

Prevailing plaintiffs may recover nominal damages, compensatory damages, punitive damages of at least $10,000, plus costs and attorney's fees

Provides affirmative defenses for disabled individuals or children under 13 accompanied by an adult of the matching sex, employees entering after oral notice for cleaning or safety purposes, and first responders performing lawful duties

Excludes unisex restrooms and changing facilities (defined as single-occupancy rooms with floor-to-ceiling walls and secure locks) from the bill's coverage