In the years after Columbine and Sandy Hook, school officials began initiating measures seeking to avoid such an event ever happing here.Those measures have seen renewed focus in the wake of a latest tragedy: the May 24 murders of 19 children and their two teachers by a lone gunman at Robb Elementary School in Uvalde.Local school districts have long implemented cameras stationed throughout school campuses, and social media monitors flagging any mention of ‘death,’ ‘firearm’, ‘kill,’ ‘suicide’ or ‘drugs.’Some districts implemented a Guardian Plan, allow ing an undisclosed number of anonymous staff to carry firearms in case a gunman does ...