Edged Weapon Defense: Is or Was The 21-foot Rule Valid?

As a prelude to more extensive studies of edged-weapon-related issues, the Force Science Research Center at Minnesota State University-Mankato has responded by reexamining the 21-Foot Rule, arguably the most widely taught and commonly remembered element of edged-weapon defense.
After testing the Rule against FSRC’s landmark findings on action-reaction times and conferring with selected members of its National and Technical Advisory Boards, the Center has reached these conclusions, according to Executive Director Dr. Bill Lewinski:

1. Because of a prevalent misinterpretation, the 21-Foot Rule has been dangerously corrupted. 2. When properly understood, the 21-Foot Rule is still valid in certain limited circumstances. 3. For many officers and situations, a 21-foot reactionary gap is not sufficient. 4. The weapon that officers often think they can depend on to defeat knife attacks can’t be relied upon to protect them in many cases. 5. Training in edged-weapon defense should by no means be abandoned.

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Related Video
Someone questioned if the rule was still valid, on ice or snow so this video is a response.
http://www.youtube.com/watch?v=SnPmNwm4dF0