The Old Approach to Active Shooter Situations,prior to Columbine,was for Police

Short Answer

The old approach to active shooter situations,prior to Columbine,was for police to take a _______________strategy,intended to prevent officers and bystanders from getting killed; first responders would establish a perimeter to contain the situation and then wait for the special-weapons team to go in and neutralize the shooters(s).Now, however,police typically employ so-called _________ _________ that confront the shooter.