the last refuge (https://theconservativetreehouse.com/2018/02/19/school-shooting-was-outcome-of-broward-county-school-board-policy-now-local-and-national-politicians-weaponize-kids-for-ideological-intents/)

explains how this was part of policy...cameras on a delayed feed due to the school and the SROs hiding evidence of crime to keep their stats happy and the government grants flowing