There are school safety teams and door locks, but also suicide prevention and deescalation techniques.
Officer Jason Gallardo, who works at Littleton High School, talks about his experiences in these times of heightened fears.
Safe2Tell saw a 50 percent increase in reports post-Parkland and other states are looking into a similar program.
A bill that took effect July 1 establishes civil liability for school districts that fail to prevent violence on campus or at district activities. But experts say vague language could put the districts at legal risk.
Three independent reports conclude that a lot more could have been done to prevent the 2013 shooting that killed two students.
Students at Sheridan Middle School decide to continue as planned a debate on gun control and school safety despite the tragic shooting at a Denver area high school.