Add Yahoo as a preferred source to see more of our stories on Google. Most states have laws that mandate lockdown drills, but the exercises differ greatly in practice. File Photo by Bill ...

School shooting preparedness drills have been a routine though uncomfortable part of the back-to-school experience.

School shooting preparedness drills have been a routine, though uncomfortable, part of the back-to-school experience. Since the 1999 mass shooting at Columbine High School in Jefferson County, ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Emily Greene-Colozzi, UMass Lowell (THE CONVERSATION) School shooting preparedness ...