In an effort to prevent future school-shooting tragedies, Sacramento's Regional Office of Homeland Security is teaching school administrators and law-enforcement agents how to identify and prepare for an active-shooter incident. 

Calling a lack of preparation the biggest threat, Sergeant Joe Basham says school administrators need to be pro-active. He says they need to come up with a plan and practice it so when something happens, they don't need to think about it. 

Retired Army Director Lt. Col. Dave Grossman, who's been called to many of the national incidents, says teachers need to take action when they see potential warning signs.

Grossman says when statements are seen on Facebook or in school work and no action is taken, it is perceived that the secret service has granted permission to proceed to the next step.