Welcome To Dennis Root’s Official Page

Violent physical attacks, shootings, and homicides are a few examples of the acts of violence that demand the professional investigator possess a particular investigative skill set. Imagine being one of the few professional investigators who possess those abilities.

Force Concepts will help you learn what to look for and how to evaluate the evidence these life-changing events may leave behind. You will learn real-world considerations that help you see directly into the heart of the force encounter. You will also learn to recognize the impact fear has on human performance and how to investigate that fear.

One of the primary goals of Force Concepts is to provide you with insights and investigative strategies for separating self-defense from criminal action. You will learn practical investigative principles that you can apply to investigations involving the use of force by police and for self-defense.

Force Concepts will help you, the professional investigator, take your investigative skills to the next level.

Clicking the “Buy Now” button above will open a new window taking you to the book purchase page on my Force Concepts Training Council website.

Force Concepts Cover


What Industry Experts Are Saying

Great book! I found Force Concepts well written, easy to follow, and contained valuable information important to all investigations, especially force investigations. Force Concepts is a must have for any investigator.

Dean Beers

Associates In Forensic Investigations, LLC

WOW! Outstanding source of information. Dennis combines memorable quotes, real-world cases, and his personal teaching style to deliver a book that is to the point and well written. Whether an experienced law enforcement officer or someone interested in discovering the truth regarding the use of force, this book provides extremely insightful information.  Based on years of experience, consulting and teaching, Dennis has produced THE source on this topic.

Kelly Riddle

Kelmar Global

From my 27 years of law enforcement service as an investigator, trainer, and administrator, Force Concepts brakes down concepts in a way anyone, at any level, can gain a clear understanding of the information provided. I was impressed with the book.

Lt. Dennis Fritchie (Ret.)

Martin County (FL) Sheriff's Office

Reading Force Concepts will be your first step in pursuing a virtual black belt in use of force investigation. Dennis shares impartial and objective strategies for those dedicated to the pursuit of the truth. Excellent book!

Brandon Perron

Criminal Defense Investigation Training Council

About the author

 Dennis Root is a nationally recognized expert in the use of force by police and for self-defense and a judicially recognized expert for investigations. He has almost 30 years of law enforcement experience and served as the force expert during the well-publicized cases involving George Zimmerman (FL) and Micah LeMaster (WV).

Dennis is also the Founder and National Director of the Force Concepts Training Council, where he teaches professional investigators to investigate situations involving the use of force. Through the FCTC, professional investigators can obtain training and apply to become a Board Certified Force Investigator.