State law defines the scope of where the anti-bullying policy applies.
Missouri Revised Statutes 160.775 Antibullying policy required
Bullying of students is prohibited on school property, at any school function, or on a school bus. […]
Notwithstanding any other provision of law to the contrary, any school district shall have jurisdiction to prohibit cyberbullying that originates on a school’s campus or at a district activity if the electronic communication was made using the school’s technological resources, if there is a sufficient nexus to the educational environment, or if the electronic communication was made on the school’s campus or at a district activity using the student’s own personal technological resources. The school district may discipline any student for such cyberbullying to the greatest extent allowed by law.