Madison officials revealed a teen student and teacher were killed in a shooting Monday morning at Madison Abundant Life Christian School. The suspected shooter, who was a teen student at the school, is dead. Police said six other people are injured, two critically, four in stable condition.
20 years ago was 2004. Columbine was five years before that. And school shootings have been happening even longer: https://en.wikipedia.org/wiki/List_of_mass_shootings_in_the_United_States
20 years ago congress let the Federal Assault Weapons Ban sunset (end without renewal).
https://en.wikipedia.org/wiki/Federal_Assault_Weapons_Ban that was AFTER Columbine.
BUT! That legislation was brought about thanks to an earlier school shooting, in 1989.
https://en.wikipedia.org/wiki/Stockton_schoolyard_shooting