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violence. let's go straight to more, tracking so much of what has done said on line. death threats have been out there, some general like social media posts urging people to kill all feds. but there have also been very specific threats, in particular aimed at the attorney general, merrick garland, and the florida judge who signed and then unsealed that search warrant. how concerned are federal officials about -- about this going from online threats to actual violence? >> reporter: yeah. well, sources told our colleague josh campbell that the fbi's investigating an unprecedented numbe...

>> they are, and i think that there's confusion about lockdown drills versus some of these other kinds of drills. as jacqueline said, lockdown drills are -- can be for a variety of different dangerous situations. and we teach people to lock the door, turn off the lights, get out of sight. and so it's not using sensorial techniques, not teaching people to fight back or having a lot of traumatizing kind of stimulation. so when done right we would argue that the benefits outweigh the risks. >> so what more do you believe, jacqueline, that schools need to do, for people to really understand the mo...