Inside a public school’s active shooter drill

Two years after a shooter killed 17 students at Marjory Stoneman Douglas High School in Florida, schools around the country are running regular active shooter drills. Vladimir Duthiers takes CBS News into one of these drills conducted with fourth grade students. Watch “CBS This Morning“ HERE: Download the CBS News app on iOS HERE: Download the CBS News app on Android HERE: Like “CBS This Morning“ on Facebook HERE: