Pre-schoolers Across U.S. Learn Reading, Writing and Active Shooter Training

Schools across the country have been participating in lockdown drills and active shooter training amid what seems like an epidemic of gun violence. Students as young as pre-school learn to crouch in silence, hiding in the dark with their teachers.  InsideEdition.com's Tara Lynn Wagner (https://twitter.com/taralynnwagner) has more.