POLICE PRACTICES EXPERT & NATIONWIDE EXPERT WITNESS
Civil Rights • Use of Force • Monell Liability • Law Enforcement Standards
Turnbull Consulting provides independent, court-ready analysis of police practices and investigations. With more than 30 years of real-world law enforcement experience, Tony Turnbull delivers clear, defensible opinions that assist attorneys, courts, and agencies in high-stakes civil rights and criminal litigation.
Attorneys rely on Turnbull Consulting for objective expert witness services grounded in nationally accepted standards, current training doctrine, and practical field experience. Every case is approached methodically, with a focus on facts, policy, and professional best practices.
About Me
Tony Turnbull – Police Practices Expert & Law Enforcement Consultant
Tony Turnbull is a highly respected police practices expert with over 31 years of real-world experience in law enforcement, criminal investigations, and police procedures. His distinguished career includes supervisory leadership and specialized expertise in jails, patrol, gangs, narcotics, violent crimes, and homicide investigations.
As an instructor for the POST Robert Presley Institute of Criminal Investigation, Tony trains law enforcement professionals across California in modern policing standards and best investigative practices. He provides expert witness testimony and consulting services in both civil and criminal litigation, offering clear, methodical, objective opinions grounded in law enforcement standards, policy compliance, and constitutional policing. He also provides expert review of historical police investigations, applying current or past professional standards to cases.
Currently serving as a retired annuitant investigator with the Sacramento County Sheriff’s Office, Tony continues to work on cold case homicides, combining decades of investigative experience with updated training in policies, procedures, and police accountability. His extensive field background, analytical approach, and courtroom credibility make him a trusted resource for attorneys, agencies, and courts seeking professional insight into police conduct, investigations, and law enforcement practices.
EXPERT WITNESS & LAW ENFORCEMENT CONSULTING SERVICES
Turnbull Consulting offers litigation-focused expert services designed to clarify complex police practices for judges, juries, and counsel. Each engagement is tailored to the legal theory of the case and the evidentiary burden required.
Areas of Expertise
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Police Practices Expert Witness
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Criminal Investigative Analysis
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Policy & Procedure Review
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Homicide Investigations
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In-Custody Death Reviews
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Violent Crime Investigations
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Search & Arrest Warrant Analysis
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Interview & Interrogations
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Jails & Prisons Operations & Standards
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Civil Rights & §1983 Case Support
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False Arrests
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Monell Liability Evaluation
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Wrongful Convictions & Malicious Prosecution Cases
Consulting & Litigation Support
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Defense and plaintiff support in civil rights and criminal cases
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Strategic case analysis for attorneys and agencies nationwide
Policy & Standards Compliance
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Assessments of law enforcement policies against current peace officer standards and training and constitutional requirements
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Expert interpretation of policing standards and best practices
Expert Review & Analysis
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Comprehensive expert evaluation of police conduct and investigative files
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Rule 26 expert reports, rebuttal reports, and written expert opinions
Expert Witness Testimony
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Deposition-ready expert witness services
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Trial Testimony in federal and state courts
Investigative Procedures Assessments
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Homicide & Violent Crime Investigations
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Search & Arrest Warrant Reviews
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Interview & Interrogations practices
ATTORNEYS RELY ON TURNBULL CONSULTING BECAUSE EVERY ANALYSIS IS BUILT FOR COURTROOM APPLICATION
Litigation-Focused Expertise
Attorneys rely on Turnbull Consulting because every analysis is built for courtroom application:
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Clear articulation of professional standards
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Defensible methodology under Daubert/Frye
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Experience testifying in civil litigation and Criminal Trials on major cases
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Reports written for judges, juries, and counsel
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Objective, unbiased opinions
Whether supporting plaintiff or defense, Mr. Turnbull’s role is to explain what competent, reasonable policing requires—and whether it occurred.
WHAT I DO...
Independent Analysis for High-Stakes Litigation
Tony Turnbull provides objective, methodical evaluation of police conduct in matters involving:
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Policy and procedure compliance
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Civil rights and constitutional violations
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Monell liability and systemic failures
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Training adequacy and supervision standards
Each engagement is grounded in accepted law enforcement standards, peer-reviewed research, and practical field experience.
CREDENTIALS
Experience That Commands Credibility
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Over 30 years in law enforcement
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Former police supervisor and investigator
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Extensive background in violent crime investigations
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Instructor in police investigations, decision-making, and procedure
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Expert witness in state and federal civil rights cases and state criminal cases
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Recognized authority in police practices and standards
This combination of field leadership and litigation experience allows for precise, real-world analysis.
WHO I SERVE
Who I Work With
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Civil rights attorneys
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Defense counsel
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Municipalities
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Insurance carriers
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Government agencies
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Courts and oversight bodies
Engagements range from pre-litigation case review to trial testimony.
Trust Signals
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Professional
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Independent
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Defensible
Every opinion is:
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Based on generally accepted police practices
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Policy-driven
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Constitutionally grounded
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Written for legal application
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Delivered with professional neutrality
My obligation is not to a narrative—it is to the standard.