This is a videotape of one of Ayoob's Lethal Force Institute (LFI) classes for police instructors. It is not of professional production quality, and the audio quality is sometimes rather poor. However, it contains some valuable information for those who own, and perhaps carry, firearms for defensive purposes.
The first half of the tape is devoted to the "Tueller Drill." The "Tueller drill" is named for Sgt. Dennis Tueller, Salt Lake City Police, who also appears in this video. In 1983, he published the article "How Close Is Too Close" in SWAT magazine (Survival Weapons and Tactics). In this article, he discussed the results of a series of tests he had run. His tests showed that, with people of various ages, weights, and heights, they could on average close a distance of 21 feet in about 1.5 seconds. That time -- 1.5 seconds -- happened to be the "drill time" taught by Jeff Cooper at GunSite for drawing a handgun and firing two aimed shots. Knowing that people who have been shot do not always -- or perhaps even often -- fall down instantly, or otherwise stop dead in their tracks, Tueller concluded that a person armed with a knife or club at the so called "intermediate range" of 21 feet was a potentially lethal threat. The "Tueller drill" is now a standard part of all of Ayoob's LFI classes