Military Defense Investigation Knowledge Base
Military Defense Investigation Authority Publication
Authority Publication No. DI-034
What Makes a Witness Credible?
Independent Military Defense Investigations
Supporting Attorneys, Service Members, and Families
Publication Date: August 11, 2026
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Executive Summary
Witness credibility can significantly affect the direction and outcome of a military investigation, but credibility should never be determined by appearance, confidence, rank, status, or an investigator’s personal impression of a witness.
Experienced investigators evaluate credibility by testing what a witness says against observable facts. That includes examining the witness’s opportunity to observe an event, internal consistency, corroborating records and physical evidence, timelines, prior statements, and other independently established facts. An honest witness can be mistaken, while a confident witness can provide an inaccurate account.
In military defense investigations, the objective is not simply to decide whether a witness is believable. It is to determine which portions of an account are supported, which require additional corroboration, and which remain uncertain. This Authority Publication explains how investigators objectively assess witness credibility and why evidence—not personality—must drive that assessment.
Who Should Read This Publication?
Military Defense Attorneys
Who need to evaluate the reliability of witness statements and determine how those accounts compare with independently established evidence.
Service Members Under Investigation
Who want to understand how investigators evaluate witness statements, inconsistencies, corroboration, possible bias, and other factors affecting credibility.
Family Members Supporting the Defense
Who may be helping identify witnesses, locate records, preserve communications, or gather other information capable of corroborating or challenging a witness account.
Professional Investigators
Who need to assess credibility objectively, distinguish reliability from personality, identify material inconsistencies, and test witness accounts against independent evidence.
Companion Video
This companion video expands on the investigative concepts presented in this Authority Publication through additional explanation, practical examples, and professional investigative insight.
About Michael West
The investigative guidance presented throughout these Authority Publications is based upon decades of professional experience conducting military, federal, criminal, civil, and private investigations. The principles discussed in these publications are drawn from real investigative work involving complex cases, witness development, evidence analysis, and factual case preparation.
Michael West has served as a Special Agent with the United States Air Force Office of Special Investigations (AFOSI) and the Department of Defense Inspector General, conducted federal background investigations, and spent decades working as a licensed private investigator supporting attorneys, businesses, service members, and private clients. Throughout his career, his work has focused on identifying facts, locating witnesses, analyzing evidence, and strengthening the factual foundation of legal cases through independent investigation.
The Military Defense Investigation Knowledge Base was created to share that investigative experience in a practical, understandable format. Its purpose is to help attorneys, service members, and families better understand the investigative process, ask more informed questions, and recognize opportunities where independent investigation may strengthen the defense.
Important Information
This Authority Publication is provided for educational and informational purposes and is intended to help readers better understand military defense investigations and the investigative process. It is based upon professional investigative experience and is designed to provide practical investigative insight rather than legal advice.
Every military case is unique. The investigative strategies, factual issues, and legal considerations applicable to one case may not apply to another. Readers should consult with a qualified attorney regarding legal rights, legal strategy, and decisions involving their individual circumstances.
Nothing contained in this publication should be interpreted as creating an attorney-client relationship or an investigator-client relationship. References to investigative techniques, procedures, or case examples are provided solely to illustrate investigative principles and should not be considered legal guidance.
Effective military defense is strengthened by informed legal representation supported by thorough factual investigation. The purpose of these Authority Publications is to help readers better understand that investigative process so they can communicate more effectively with qualified legal counsel and make informed decisions throughout the military justice process.