Most of the "no duty to act" precedent revolves around normal cops on patrol who witness crimes and don't stop them or who don't show up expediently when a crim

Most of the "no duty to act" precedent revolves around normal cops on patrol who witness crimes and don't stop them or who don't show up expediently when a crime is called in. Being tasked with securing a school likely establishes a specific duty do do that job regardless of whether or not there's other state law establishing that duty.