https://www.usconcealedcarry.com/blog/gun-free-school-zones-act-of-1990-what-is-it/
The bill allows exceptions for those licensed to carry firearms (only 14 states allowed concealed carry prior to 1990), law enforcement officers and contractors employed and authorized by the school. It also allows carry within private property — homes and businesses — that just so happen to fall within that 1,000-foot imaginary line.