Police use-of-force practices expert

Expert class library · Civil rights · Either side

A former officer or police practices specialist who compares an officer's use of force, pursuit or tactics with generally accepted police training, national standards and department policy, in Section 1983 excessive force cases and in prosecutions of officers. Courts generally allow testimony on accepted practices and policy, but bar opinions that the force was excessive or unreasonable as a legal matter, opinions a jury can reach unaided from video, and case-specific opinions not stated to a reasonable degree of probability.

What this expert is retained to answer

• What did generally accepted police practices, national standards and the department's own policies require of the officers in this encounter?
• Did the officers' tactics, warnings and escalation match their training, and where did they depart from it?
• Is the expert describing police standards, or telling the jury that the force was excessive or unreasonable under the law?
• If the encounter is on video, what does the expert add that the jury cannot see for itself?
• Are the expert's case-specific opinions stated to a reasonable degree of probability and based on facts in the record?

Methods

• Use-of-force continuum and policy comparison
• POST training standard review
• Body camera and dashcam analysis
• National police practice standards comparison
• Graham v. Connor factor framing

How the testimony is attacked

• Legal conclusion on excessive force. Defendants argue that an opinion that force was excessive or objectively unreasonable tells the jury what result to reach. In Estate of Collins v. Wilburn the court excluded a police practices expert in part because the crux of his opinion was that the officers' force was excessive, which courts in the Sixth Circuit do not allow.
• The video speaks for itself. When the encounter was recorded, defendants argue the expert adds nothing. In Collins the court held the expert's testimony would not help a jury that could watch the video and draw its own conclusions.
• Case-specific opinions not held to a reasonable probability. Challengers attack opinions offered only as possibilities or through hypotheticals built on another expert's reconstruction. In Dasho v. City of Federal Way the court barred the plaintiff's police practices expert from giving any opinion on the specific use of force, by report or hypothetical, while allowing his testimony on general police practices and standards.
• No personal knowledge, facts outside the record. Defendants argue the expert relies on facts no witness supplied. In Hyer v. City and County of Honolulu the Ninth Circuit held that experts need not have personal knowledge or confine themselves to the summary judgment record, and reversed the wholesale exclusion of the plaintiffs' expert reports.
• Experience is not a method. Opponents say a career in policing is not a reliable methodology. In United States v. Zabavsky the court admitted police procedures experts whose opinions rested on practical experience, department general orders and national standards, and treated disputes over the facts they assumed as matters of weight.

What the public record shows

A deliberately narrow CourtListener search, ("police practices" OR "use of force") AND police AND expert AND (Daubert OR "Rule 702"), returned 187 opinions filed since 2015, as of October 3, 2026; broader searches return more. 4 rulings that show how courts handle this class of testimony:

Each case links to the free opinion text on CourtListener.

Under amended Rule 702

Since December 1, 2023, Rule 702 says expressly that the party offering an expert must show the court it is more likely than not that the testimony meets each requirement: that it rests on sufficient facts or data, uses reliable methods, and reflects a reliable application of those methods to the case. Questions about the basis of an opinion are no longer automatically matters of weight for the jury. For how the circuits have applied the amendment, see the Rule 702 tracker, which follows each court of appeals; for what that means for preparing or attacking this class of expert, see the guide on amended Rule 702.

Related classes

• Industry custom and practice expert
• Biomechanical engineer
• Specific-causation physician

Guides

• Amended Rule 702 After Nearly Three Years: What Courts Exclude

Simulating this class on a matter

Supreme Mind simulates a class of expert, never a named individual, on your fact pattern and returns the likely opinion, the ranked cross-examination weaknesses, the Rule 702 attack surface and what it means for settlement. Read how it works, or book a demo.

Last reviewed October 3, 2026. How this page is built: rulings are found by searching court opinions on CourtListener, and each one is read in the opinion before it is summarised here; outcomes are labelled by what the court did with the expert's testimony. No individual expert is named. This page summarises public decisions for orientation and is not legal advice; read the opinion before relying on any ruling.