Public schools; school security and discipline; employment of school security officers; training requirements. Amends the requirements for the training course of which an individual employed as a school security officer is required to submit proof of completion to the Department of Criminal Justice Services in order to carry a firearm in the performance of his duties by (i) eliminating the requirement that such training course include training in active shooter emergency response and, instead, requiring it to include training in critical incident preparedness and response and (ii) clarifying that such training course include training in behavioral threat assessment.