This is how the slippery slope works. First, you pass a law that allows certain school staff — but not teachers — to arm themselves on Florida school campuses. The next year, you come back with another law that lets teachers carry guns in classrooms. … Don’t be surprised if next year some lawmaker whips out a proposal that requires school districts to arm staff and teachers, especially if the voluntary program isn’t getting enough takers. It’s not far-fetched. The current bill would allow individual charter schools to decide on arming teachers, even though charter schools are overseen by school districts.