Surely there must be open source material on this issue, particularly after the introduction of "shoot, don't shoot" training, first in the open air (Clint Eastwood in Magnum Force) and then video screen enabled tests? IFF is too military and technical term for searching.

The comparatively short range of many LE shooting incidents, as referred to often, is a significant factor as the human eye can see the possible target(s) clearly compared to up 300m away.

A few thoughts from someone in an armchair.