For more than 20 years now, a concept called the 21-Foot Rule has been a core component in training officers to defend themselves against edged weapons.
Originating from research by Salt Lake City trainer Dennis Tueller and popularized by the Street Survival Seminar and the seminal instructional video "Surviving Edged Weapons," the "rule" states that in the time it takes the average officer to recognize a threat, draw his sidearm and fire 2 rounds at center mass, an average subject charging at the officer with a knife or other cutting or stabbing weapon can cover a distance of 21 feet.
Recently a Force Science News member, a deputy sheriff from Texas, suggested that "it's time for a fresh look" at the underlying principles of edged-weapon defense, to see if they are "upheld by fresh research." He observed that "the knife culture is growing, not shrinking," with many people, including the homeless, "carrying significant blades on the street." He noted that compared to scientific findings, "anecdotal evidence is not good enough when an officer is in court defending against a wrongful death claim because he felt he had to shoot some[body] with a knife at 0-dark:30 a.m."
More @ Police One
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