Five agencies—New York Police Department, Dallas Police Department, Cincinnati Police Department, New Orleans Police Department, and Louisville Metro Police Department—were studied as agencies with de-escalation policies, or de-escalation policies implemented sometime during the past five years. These five agencies totaled 42,444 total officers. In comparing these agencies to a pre-, and post-de-escalation environment, it was determined that officers were more than twice as likely to be killed in the line of duty and 10 times as likely to be injured in the line of duty during years when de-escalation policies went into effect.
A simple formula was used to find these results. The formula required the formulation of what I termed a "danger factor" per department. A danger factor is the percentage of incidents divided by the total number of sworn officers per agency. The danger factor was used in two categories that could best measure the effects of officer safety, with one category representing officers killed in the line of duty from a force-related incident and the other being those injured from force-related incidents. Data was collected from each agency independently from open source records or public information requests. This was done to provide a more accurate collection of data of all harmful events during force-related incidents specific to the agency.
For example, Dallas has approximately 3,484 sworn officers. In the years researched from 2012-2017, the Dallas PD had a danger factor of zero in the category of officers killed, except for 2016 when 4 of its officers were murdered in a sniper attack. Thus the 2016 danger factor was .0011 (4/3484=.0011%). In that same year, the City of Dallas reported 234 officer injuries from arrest- or force-related incidents, making the danger factor .067 (234/3484=.067%).
When comparing the five named agencies in years with de-escalation policies, to those years without, the danger factor of officer injuries when de-escalation was in place was considerably higher, .37% to .03%. When it came to officer deaths, years without de-escalation policies cumulatively produced a danger factor of .00012%, but jumped substantially to .00028% when de-escalation policies were in effect.
I also examined a comparable group of agencies as a control. The control agencies—Chicago Police Department, Los Angeles Police Department, Milwaukee Police Department, Tucson Police Department, San Diego Police Department, and Orlando Police Department—employ a total of 31,996 officers. While some of these agencies admittedly have de-escalation training, current policies specific to mandating de-escalation were either non-existent or had not yet been implemented at the time of my study.