Brent W. Petersen
Law Enforcement Consultant & Expert Witness
Areas of Expertise: police use of deadly force; homicide and death investigations; police policies and procedures; criminal procedure; investigative practices; sexual assault investigations; interviewing and interrogation; crime scene investigation; law enforcement training and peer support; public speaking; expert witness testimony.
Brent Petersen is a retired law enforcement professional with 27 years of experience in criminal investigations. He has served as primary investigator in 1,000+ criminal investigations and 50+ police officer use-of-deadly-force investigations, including the high-profile cases of George Floyd (Minneapolis, 2020), Justine Damond-Ruszczyk (Minneapolis, 2017), and Daunte Wright (Brooklyn Center, 2021). He also co-founded the BCA Force Investigations Unit to investigate incidents involving law enforcement use of deadly force and other critical events. NorthStar accepts use-of-force matters only outside Minnesota.
His career included various positions with two mid-to-large city police departments as a patrol officer, detective, sergeant, crime scene investigator and field training officer, as well as a Special Agent with the Minnesota Bureau of Criminal Apprehension (BCA). These positions developed proficiency in frontline and investigative law enforcement operations. Over nearly three decades in law enforcement, Brent became best known for his skill as an interviewer and interrogator, often being called upon to handle delicate or difficult cases requiring exceptional patience, diplomacy, and discretion. Examples include trauma-informed interviewing, cognitive interviewing, and working with child victims and witnesses as a certified child forensic interviewer.
An accomplished public speaker, Brent has created 75+ seminars for conferences and law enforcement in-service trainings, and has been a guest speaker at colleges and law schools on a variety of law enforcement topics including homicide and death investigations, interviewing and interrogation procedures, criminal procedure and investigations, police use-of-deadly-force, sexual assault investigations, and sex trafficking. One of his cases was featured in CBS' production "48 Hours," episode: "What the Neighbors Saw," which originally aired March 21, 2026.
Brent's professional experience also includes a fellowship with the Ramsey County Medical Examiner's Office, and advanced forensic evidence gathering and crime scene processing. He has prepared for and testified in hundreds of state and federal court proceedings and trials.
Brent retired from active-duty law enforcement in July 2026. As a consultant, he is currently available for speaking engagements, death and homicide case review, forensic consulting, independent evaluations of law enforcement practices and procedures and law enforcement training. He is also available as an expert-witness in the following types of cases: homicide and death investigations, interviewing and interrogation procedures, criminal procedure and investigations, police use-of-deadly-force, and sexual assault investigations.