Modifies guidelines for student participation in athletic contests organized by sex

HB 1663 requires schools to restrict athletic participation to students competing in sports designated for their biological sex, as documented on their birth certificate or another government record. It prohibits schools from allowing students to compete in sports designated for the opposite biological sex unless no equivalent sport is available for the student's assigned sex. The bill defines "biological sex" based on reproductive biology at birth and specifies that birth certificate documentation must reflect the sex assigned at birth or correct a clerical error. Violations could result in loss of state funding, and affected students or parents may seek legal remedies. The law expires in 2027.