You would think that schools, places of worship and large gatherings would be main targets for active shooters, but according to the FBI, close to 50% of incidents that happened in the US between 2000 and 2013 were in places of commerce and shopping malls.  Considering these statistics, business owners do need to review this guide on Active Shooters by Homeland Security.  This is the one time having a floor plan easy to reach from your phone could be the difference between life and death.  Same thing with a first aid kit.  Having employees trained in first aid could help a victim survive until help arrives.