The Article 32 preliminary hearing is the gateway between a preferred charge and referral to a general court-martial. It is presided over by a preliminary hearing officer, or PHO, who is a neutral official rather than an advocate for either side. When the government and the defense each present expert opinions that point in opposite directions, the PHO has to make sense of that conflict without conducting a full trial. The way a PHO handles dueling experts reflects the limited but real purpose of the hearing and the unusual evidentiary rules that govern it.
The narrow purpose of the Article 32 hearing
Article 32, codified at 10 U.S.C. 832, requires a preliminary hearing before a charge may be referred to a general court-martial. The hearing is not a trial and it is not designed to resolve guilt. Its purpose is limited and statutory. The PHO determines whether the specification states an offense under the UCMJ, whether there is probable cause to believe the accused committed the charged offense, whether the convening authority has court-martial jurisdiction over the accused and the offense, and what disposition the PHO recommends.
Probable cause is the operative standard, and it is far lower than proof beyond a reasonable doubt. This single fact shapes everything about how conflicting expert opinions are treated. The PHO is not asked to decide which expert is correct. The PHO is asked whether, taking the evidence as a whole, there is probable cause to believe an offense occurred and that the accused committed it.
The PHO as a neutral official
Whenever practicable, the PHO is a certified judge advocate. When that is not practical, the convening authority may detail an impartial commissioned officer. Either way, the PHO is meant to be neutral and does not represent the government or the defense. The PHO hears the evidence, rules on questions of admissibility within the limited rules that apply, and submits a written report with findings and a disposition recommendation to the convening authority.
That neutral posture matters when experts conflict. The PHO is not a partisan trying to vindicate one side’s expert. The PHO weighs both presentations against the modest probable-cause threshold.
Relaxed rules of evidence change the picture
A defining feature of the Article 32 hearing is that the Military Rules of Evidence largely do not apply. With limited exceptions for privileges, certain interrogation rules, and the rape-shield protections of MRE 412, the rules of evidence are not in force. When an evidentiary rule does apply, the term military judge in that rule is read to mean the PHO.
The practical effect is large. Because the rules of evidence are relaxed, expert material can reach the PHO in forms that would be inadmissible at trial. The government may present an expert’s written report or a summary rather than live testimony, and hearsay is generally usable. The defense may likewise submit competing expert material. This means the PHO often confronts conflicting expert opinions on paper, without the live examination and cross-examination that would test them at a court-martial.
How a PHO addresses the conflict
Given the narrow purpose and the relaxed evidentiary environment, a PHO addresses conflicting expert opinions in a way that differs sharply from how a fact-finder resolves them at trial.
First, the PHO frames the question correctly. The issue is not which expert is right. The issue is whether, even with the conflict, probable cause exists. A genuine conflict between qualified experts often does not defeat probable cause, because probable cause requires only a reasonable belief, not a resolution of every dispute.
Second, the PHO considers both opinions as part of the total evidentiary picture rather than choosing a winner. The PHO can note that the experts disagree, describe the nature of the disagreement, and assess whether the government’s evidence, viewed alongside the competing opinion, still meets the probable-cause standard. A defense expert who casts doubt on the government’s theory is relevant, but it does not necessarily eliminate probable cause.
Third, the PHO can hear from the experts to the extent the hearing allows and can question them, since the PHO is responsible for hearing the evidence and ruling on admissibility. Where live testimony is presented, the PHO can observe how each expert holds up. Where only written material is offered, the PHO evaluates the reports on their face.
Fourth, the PHO documents the conflict in the report. A thorough PHO report will acknowledge the competing expert opinions, explain how they bear on the probable-cause analysis, and fold that assessment into the disposition recommendation. This gives the convening authority a clear picture of the strengths and weaknesses of the case, including the existence of a credible defense expert.
Why a PHO will rarely resolve the dispute outright
Trying to definitively resolve a battle of experts would exceed the function of the hearing. Credibility determinations between competing experts, the weighing of methodology, and the ultimate question of which opinion the trier of fact should believe are matters reserved for the court-martial, where the full Military Rules of Evidence apply, where experts are qualified under those rules, and where members or a military judge decide the facts under the reasonable-doubt standard.
A PHO who purported to decide that the government’s expert was wrong and the defense expert was right would be substituting a trial verdict for a probable-cause screening. The proper course is more limited: recognize the conflict, decide whether probable cause survives it, and pass a candid assessment forward.
What this means for the defense
For defense counsel, the conflicting-expert situation at Article 32 is an opportunity even though the PHO will not resolve it. Presenting a credible expert opinion can shape the PHO’s disposition recommendation, give the convening authority reason to question the case, and create an early record of the defense theory. Because the rules of evidence are relaxed, the defense can often submit expert material efficiently. But counsel should understand that a strong defense expert usually will not result in a finding of no probable cause; its value lies in influencing disposition and in building the case for trial.
The bottom line
A PHO addresses conflicting expert opinions by keeping the hearing’s limited purpose in view. Operating under relaxed evidence rules and the low probable-cause standard, the PHO weighs both opinions as part of the whole record, declines to crown a winner, and reports the conflict candidly to the convening authority. The genuine resolution of which expert the fact-finder should believe is left where it belongs, at the general court-martial.
Disclaimer
This article is provided strictly for general educational and informational purposes. It is intended to explain how the Uniform Code of Military Justice (UCMJ), the Rules for Courts-Martial, the Military Rules of Evidence, and related military administrative processes work as a matter of public legal education. It does not constitute legal advice, a legal opinion, or a recommendation about any particular case, and it is not a substitute for advice from a qualified military defense attorney who can evaluate the specific facts and command, service, and jurisdictional circumstances involved.
Reading this article, or contacting any website on which it appears, does not create an attorney-client relationship between the reader and any law firm, attorney, or author. Every court-martial, nonjudicial punishment action, administrative separation, and security-clearance matter turns on its own facts, the charged articles, the convening authority, the service branch, and the evidence, and outcomes vary widely from one case to another.
Military law also changes over time. The Military Justice Act of 2016 (effective January 1, 2019) and subsequent National Defense Authorization Acts renumbered and rewrote many punitive articles, revised the Article 32 preliminary hearing, and altered sentencing, clemency, and appellate procedures. Statutes, regulations, executive orders, the Manual for Courts-Martial, and decisions of the service Courts of Criminal Appeals and the Court of Appeals for the Armed Forces may have been amended, superseded, or reinterpreted after this article was written, and article numbers or procedures cited here may have changed.
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