The term ‘safe distance’ has allowed the 21-foot rule to become a standard in the field, but it places officers in danger. Simple movement techniques allowed the officer to avoid being touched by the knife more than simply standing still and drawing. De vier onderzoeksvragen:
(1) How fast can a suspect run 21 feet?
(2) Is the officer able to draw and fire before the suspect can move 21 feet?
(3) How fast can an officer draw and fire his or her weapon at a charging suspect?
(4) Is there anything that an officer can do to provide more reaction time?
William L. Sandel , M. Hunter Martaindale & J. Pete Blair (2020): A scientific examination of the 21-foot rule, Police Practice and Research.