▁continues , ▁this ▁elimin ating ▁need ▁for ▁complete ▁emer gency ▁lock down , ▁dis ruption ▁and ▁del ays ▁in ▁res umption ▁of ▁teaching , ▁etc . ▁The ▁consequences ▁of ▁not ▁having ▁procedures ▁to ▁implement ▁such ▁lock down s ▁is ▁that ▁the ▁situation ▁might ▁quickly ▁es cal ate ▁where ▁there ▁could ▁be ▁loss ▁of ▁human ▁lives . ▁ ▁Emer gency ▁lock down E mer gency ▁lock down s ''' ▁are ▁implemented ▁when ▁there ▁is ▁im min ent ▁threat ▁to ▁the ▁lives ▁or ▁risk ▁of ▁injury ▁to ▁humans , ▁for ▁example , ▁a ▁school ' s ▁emer gency ▁lock down ▁procedures ▁must ▁be ▁kept ▁short ▁and ▁simple ▁to ▁make ▁them ▁easier ▁to ▁use ▁under ▁real ▁life ▁crisis ▁conditions . ▁Simple ▁procedures ▁can ▁be ▁easily ▁taught ▁with ▁periodic ▁lock down ▁dr ills ▁instead ▁of ▁length y ▁training . ▁▁ ▁In ▁inf ect ious ▁dise ases ▁▁ ▁Lock down s ▁can ▁limit ▁movements ▁or ▁activities ▁in ▁a ▁community ▁while ▁allowing ▁most ▁organizations ▁to ▁function ▁normally , ▁or ▁limit ▁movements ▁or ▁activities ▁such ▁that ▁only ▁organizations ▁supp lying ▁basic ▁needs ▁and ▁services ▁can ▁function ▁normally . ▁ ▁COVID - 1 9 ▁pan demic ▁During ▁the ▁ 2 0 1 9 – 2 0 ▁coron av irus ▁pan demic , ▁the ▁term ▁lock down ▁was ▁used ▁for ▁actions ▁related ▁to ▁mass ▁quar ant ines . ▁By ▁early ▁April ▁ 2 0 2 0 , ▁ 3 . 9   b ill ion ▁people ▁world wide ▁were ▁under ▁some ▁form ▁of ▁lock down — more ▁than ▁half ▁the ▁world '