Modifies guidelines for student participation in athletic contests organized by sex

This bill requires Missouri public and private schools, including colleges, to allow students to participate in athletic competitions only in categories matching their biological sex as recorded on their official birth certificate or another government record. It prohibits participation in sports designated for the opposite biological sex, with one exception: a female student may compete in a male-designated sport if no comparable female sport is available. Schools violating this rule risk losing state funding, and affected students or parents can sue for relief, including attorney fees. The policy aims to ensure athletic opportunities for female students by requiring participation based on birth sex records.