Colorado already has measures in place to prevent school shootings, where are the gaps?

Colorado has seen 25 incidents of gunfire on school campuses since 2013, according to Everytown for Gun Safety, a national gun violence prevention organization.

But the state’s experience with school violence stretches back much further. The 1999 attack at Columbine High rocked the state — as well as the nation — and continues to shape Colorado’s approach to student violence.