Statistical data on how a command disciplines different groups of service members can be relevant to a selective prosecution claim, but it is rarely enough on its own, and the threshold to even obtain such data through discovery is demanding. The reason lies in the constitutional standard that governs selective prosecution claims and in how military courts have adapted that standard to courts-martial.
What a selective prosecution claim is
A selective prosecution claim does not argue that the accused is innocent. It argues that the decision to prosecute this particular person was made for a constitutionally impermissible reason, such as race, religion, or the exercise of a protected right, and that others who were similarly situated were not prosecuted. It is rooted in the equal protection guarantee, which applies to service members through the Due Process Clause of the Fifth Amendment.
Because prosecutors are presumed to act in good faith and within their lawful discretion, a defendant who raises this claim carries a heavy burden. The claim is a challenge to the exercise of prosecutorial discretion, not to the strength of the evidence.
The governing standard
The leading authority is the Supreme Court’s decision in United States v. Armstrong, 517 U.S. 456 (1996). Armstrong holds that to prevail on a selective prosecution claim, a defendant must show both a discriminatory effect and a discriminatory purpose. The discriminatory effect element requires showing that similarly situated individuals of a different group were not prosecuted. The discriminatory purpose element requires showing that the prosecutorial decision was motivated by a discriminatory intent.
Armstrong also addresses discovery. The Court held that even to obtain discovery on a selective prosecution claim, a defendant must first produce some credible evidence tending to show both elements, including evidence that similarly situated people of other groups were not prosecuted. The discovery threshold is lower than the standard to win on the merits, but it is still a real barrier designed to prevent fishing expeditions into prosecutorial files.
Where statistics fit, and where they fall short
This is the crux of the question. Raw statistics showing that one group is disciplined or prosecuted at a higher rate than another can be relevant, but courts have been skeptical of statistics standing alone for several reasons.
First, statistics about discipline rates often do not establish that the compared individuals were similarly situated. Two service members are similarly situated only if they engaged in roughly the same conduct under roughly the same circumstances and differ only in the impermissible characteristic. A disparity in overall discipline rates may reflect real differences in underlying conduct, evidence strength, or aggravating factors rather than discrimination. Without controlling for those variables, the numbers do not prove differential treatment of comparable cases.
Second, statistics alone usually do not establish discriminatory purpose. A disparity in effect, even if shown, does not by itself prove that any decisionmaker acted with intent to discriminate. The purpose element generally requires something more, such as direct evidence of bias or a pattern so stark that intent can be inferred.
Third, command discipline data are often aggregated in ways that obscure the case-by-case comparisons the law requires. Numbers about nonjudicial punishment, administrative separations, and courts-martial across an entire command may not isolate the specific charging decision at issue.
Admissibility versus sufficiency
It is important to separate two questions. The first is whether statistical evidence is admissible. Under the Military Rules of Evidence, statistical data can be admissible if it is relevant and properly authenticated, and if its probative value is not substantially outweighed by considerations such as confusion or undue delay. Expert testimony may be needed to explain the methodology.
The second question is whether the statistics are sufficient to meet the Armstrong standard. Even admissible statistics frequently fail this test because they do not establish similarly situated comparators or discriminatory intent. So the answer to whether such data are admissible is often yes in principle, but the answer to whether they will carry a selective prosecution claim is usually no without substantial additional evidence.
The military context and recent reforms
Courts-martial add a wrinkle. Until recently, the convening authority and commander exercised significant disposition discretion. For covered serious offenses, including Article 120 offenses committed on or after late December 2023, that authority shifted to independent special trial counsel under reforms enacted in recent National Defense Authorization Act legislation. This change affects who the relevant decisionmaker is for a selective prosecution analysis and may reshape what comparator data are even meaningful. A claim arising from a recent charging decision should account for which authority actually made the decision.
Building a credible comparator set
Because the similarly situated requirement is where most statistical showings collapse, the defense effort usually focuses on identifying genuine comparators rather than on aggregate rates. A persuasive comparison isolates cases involving the same or closely similar conduct, comparable evidence, and comparable aggravating or mitigating factors, differing only in the protected characteristic and in whether prosecution followed. Even a small number of well-matched comparator cases that were not prosecuted can be more compelling than a large dataset of loosely grouped dispositions, because the matched cases speak directly to differential treatment.
Statistical analysis can support such a showing when an expert controls for the relevant variables and explains why a disparity is unlikely to be explained by legitimate factors. But the analysis must be tied to the specific charging decision and the specific decisionmaker, not to command-wide outcomes that sweep together unrelated determinations. Courts scrutinize whether the methodology actually measures what the equal protection inquiry asks.
Practical takeaways
A service member considering a selective prosecution motion should understand that statistics are a tool, not a trump card. They are most useful when combined with evidence identifying specific, genuinely comparable cases that were not prosecuted, and with evidence bearing on the decisionmaker’s intent. To obtain discovery of command data, counsel will generally need to make the threshold showing Armstrong requires. Because the standard is exacting and the military prosecutorial structure has changed, these motions require careful factual development and experienced counsel.
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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