ACTIVE SHOOTER RESPONSE
The active shooter response initiated by patrol officers in this type of incident works! This concept was developed in a large part by the Columbus Ohio Police Department SWAT team following the 1999 murder (we can certainly say “terrorist attack” here) of multiple high school students at Columbine High School by two “fellow students”. In that incident, patrol officers responded, set up perimeter, and using the response model in place at that time, waited for SWAT.
When confronting an active shooter, someone who has just killed numerous people and whose identification is positive, there is no time for verbal commands or discussion. What I teach to my patrol people and to police cadets is that this type of killer, terrorist or deranged lunatic (sometimes one in the same), is killing in a conditioned fashion.