Developing Evidence for a Military Rule of Evidence 412 Motion

Independent Military Defense Investigations

Supporting Attorneys, Service Members, and Families

Publication Date: August 31, 2026

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Executive Summary

Evidence offered in connection with an M.R.E. 412 motion must begin with a precise factual purpose—not a broad search through someone’s private life.

In a military case, a disputed phrase, prior communication, or other sensitive fact may carry a meaning that cannot be evaluated from an isolated allegation. The defense investigation must identify the exact proposition counsel needs to test, locate lawful and non-propensity sources, and preserve the complete context.

This Authority Publication explains how an investigator can authenticate records, identify participants and dates, document collection methods, and distinguish what a source establishes from what it does not. It also emphasizes the importance of recording unfavorable context and unresolved limitations instead of overstating a favorable gap.

Read the complete publication to learn how disciplined source mapping, preservation, and careful reporting can help counsel evaluate an M.R.E. 412 issue while respecting privacy and legal boundaries.

Who Should Read This Publication?

Military Defense Counsel

Use this publication to define the factual proposition, investigative scope, legal purpose, and preservation priorities before sensitive evidence is collected. It helps counsel translate a potential M.R.E. 412 theory into focused investigative assignments.

Defense Investigators

Learn how to locate, authenticate, preserve, and report non-propensity evidence without conducting an unfocused inquiry into sexual history. The emphasis is on complete records, documented methods, and carefully limited conclusions.

Service Members

Understand why the defense may need specific communications or records and why complete, truthful context matters more than selecting only favorable fragments. Do not contact witnesses or alter evidence without counsel’s direction.

Experts

See how technical or subject-matter expertise should answer a defined question and remain tied to authenticated source material. Expert analysis should clarify limits, not substitute assumptions for missing facts.

Families

Learn how to support lawful preservation and organization of information without contacting witnesses, searching private accounts, circulating allegations, or expanding the inquiry beyond counsel’s instructions.

Download the Official Authority Publication (PDF)

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.