AP: Firms sell school 'hardening' as mass shooting solution

Security companies spent years pushing schools to buy more products — from "ballistic attack-resistant" doors to smoke cannons that spew haze from ceilings to confuse a shooter. But sales were slow, and industry's campaign to free up taxpayer money for upgrades had stalled.

That changed last February, when a former student shot and killed 17 people at a Florida high school. Publicly, the rampage reignited the U.S. gun-control debate. Privately, it propelled industry efforts to sell school fortification as the answer to the mass killing of American kids.