Johnson City Schools Will Test Its New Centegix Crisisalert System At Science Hill High School Friday Morning At 9:45. Science Hill Principal Josh Carter Says Announcements Will Be Made Before And After The Test To Ensure Students Know It’s Not A Real Emergency. The Community May See Increased Police And Emergency Vehicles On Campus During The Drill. The System, Installed This Summer, Allows Staff To Trigger Alerts For Emergencies Using Badges They Carry. Localized Alerts Notify Staff Of Minor Issues, While A Serious Threat Triggers A Full Lockdown With Automated Announcements, Flashing Beacons, And Police Response.