Can Miss Crabtree pack heat? These 18 states allow K-12 teachers to carry.

Donald Trump likes the idea of teachers bearing arms in the K-12 classroom. “I will get rid of gun-free zones on schools — you have to,” the Republican nominee told a crowd at a campaign rally in Burlington, Vt., in 2016. “My first day, it gets signed, okay? My first day. There’s no more gun-free zones.”

More than a year later, nothing has changed. After a monster killed 17 people in a Florida high school on Valentine’s Day though, calls for arming teachers have increased. “There is an interim solution against murderous assailants: shoot back,” a Wall Street Journal editorial concluded. “There is evidence it works.”

That last point is controversial but somewhat accurate. When an evil man with a gun opened fire on a small Baptist church in rural Texas last November, it was a proverbial good guy with a gun who stopped him but not before 17 were killed. Why, Second Amendment advocates ask, couldn’t that work at school?

What’s stopping teachers from bringing guns to work right now? The Gun-Free School Zones Act of 1990. Sponsored by then-Sen. Joe Biden and signed into law by then-President George H.W. Bush the law makes it illegal for anyone “to knowingly possess a firearm” within 1,000 feet of a school zone.

And what’s stopping Trump from following through on his campaign promise?