https://www.facebook.com/USCCA/photos/a.10150190866609371.329707.166833599370/10152636153194371/?type=1 Not really an article, but a little blurb on Facebook. From the US Conceal Carry Association USCCA Tip of the Day: If you're carrying a concealed firearm and an attacker comes at you from 21 feet away with a knife, who wins? Not necessarily you! Lieutenant Dennis Tueller of the Salt Lake City Police Department demonstrated that simply having a firearm doesn't necessarily mean you could bring it into action in time to protect yourself. Tueller proved that it takes an attacker approximately 1.5 seconds to cover 21 feet and that most average armed citizens cannot clear their gun from a holster and get it on target in that amount of time. Based on Tueller's experiment, most police departments now consider anything within 32-50 feet to be within the "danger zone."