So, I was thinking the other day....if school computers are networked in a district, can't they be used to alert teachers and staff to intrusion or safety concerns. For example, if an intruder enters a building and there's a need for lockdown, just like teller's can notify police, couldn't that same button set-up send an instant screen to every computer in the building (or district) with a lockdown message? I'm not saying to replace what is already done but to enahnce what is already done.
At Sandy Hook, someone turned on the speaker system and teachers figured out it was an intruder. The same action could instantly send a message to the computer screens to eliminate the precious time it takes to figure out what the sounds represented.