Found the following on Tyler Cowen’s blog:
Schools in at least three states will be equipped with drones this year that can zoom through halls, smash windows and pepper-spray active shooters if teachers report a threat.
At least nine schools — three in Florida, five in Georgia and one in Colorado — will have storage boxes that house the plastic, nonlethal aircraft made by Austin-based Mithril Defense. The drones, which can be activated by teachers, are capable of reaching a shooter within 15 seconds.
The aircraft are designed to distract their targets by flashing strobes, blaring sirens, spraying them with pepper gel, or ramming into them at 60 mph.