I'll second notable, and raise you another dig, if I may.
Only rehashing old dig that didn't take.
https://qresear.ch/?q=nettalon
https://www.cnbc.com/video/2018/02/28/a-non-gun-solution-to-the-school-gun-problem-nettalon-founder-on-school-security-system.html
Network Plugs for security system after shooting
http:// fox59.com/2014/09/08/exclusive-in-school-unveils-revolutionary-security-system-to-thwart-shootings/