Service members sometimes try to bolster their credibility by pointing to a polygraph examination. In a typical scenario, the government has not arranged or requested any polygraph, so the accused obtains an examination privately, often through a civilian examiner, and then wants to introduce that examiner’s interpretation at trial to show truthfulness. The instinct is understandable. If an independent examiner concludes the accused showed no deception, why should the court-martial not hear it? The answer in the military justice system is clear and unfavorable to that instinct. A specific rule of evidence bars polygraph evidence in courts-martial, and it does so regardless of who conducted the examination or whether the government chose to pursue one.
Military Rule of Evidence 707 and its scope
The controlling authority is Military Rule of Evidence 707. The rule was enacted in 1991 and makes polygraph evidence categorically inadmissible in courts-martial. Its reach is deliberately broad. The rule bars three distinct categories of polygraph information from being admitted into evidence: the results of a polygraph examination, the opinion of the polygraph examiner, and any reference to an offer to take, a failure to take, or the taking of a polygraph examination.
Each of those categories matters to the third-party scenario. The “results” category bars the underlying charts and their scoring. The “opinion of the polygraph examiner” category is the one that directly forecloses a third-party interpretation, because an interpretation is exactly that, an examiner’s opinion about what the physiological data show. The third category sweeps in even the bare fact that an examination occurred, so an accused cannot circumvent the rule by alluding to a favorable test without offering the result itself. There is no exception in the rule for examinations arranged by the defense, conducted by a private or civilian examiner, or undertaken because the government declined to test. The identity of the examiner and the government’s posture toward testing are irrelevant to admissibility.
The government’s decision not to test changes nothing
A common misconception is that the government’s refusal to administer or request a polygraph somehow opens the door for the defense to offer its own. It does not. Military Rule of Evidence 707 is a flat prohibition that applies to the evidence itself, not to a particular party. Because the rule excludes the examiner’s opinion and any reference to the examination, a privately obtained, third-party interpretation falls squarely within the prohibition. The fact that the prosecution declined testing neither creates a defense entitlement nor triggers any fairness exception. The rule is the same whether the polygraph was offered by the prosecution, requested by the defense, or arranged unilaterally by the accused.
The Supreme Court has upheld the ban
The constitutionality of this categorical exclusion is settled. In United States v. Scheffer, decided in 1998, the Supreme Court considered an airman who had passed a government-administered polygraph indicating no deception about drug use, only to test positive on a urinalysis and be charged with wrongful use. The military judge applied Military Rule of Evidence 707 to exclude the polygraph evidence the accused wanted to offer in support of his testimony. The accused argued that the rule unconstitutionally abridged his right to present a defense.
The Supreme Court rejected that argument and upheld the rule. The Court reasoned that the exclusion served legitimate interests, including ensuring that only reliable evidence reaches the fact-finder, preserving the court-martial’s role in determining credibility, and avoiding collateral litigation over the reliability of polygraphy. The Court emphasized that the scientific community has not reached consensus on polygraph reliability, which justified a per se rule rather than a case-by-case reliability inquiry. The practical lesson of Scheffer is that even a favorable, exculpatory polygraph result is inadmissible, and the accused has no constitutional right to put it before the members. That holding applies with equal force to a third-party examiner’s interpretation obtained after the government declined to test.
Why this differs from the civilian federal approach
The military rule is notably stricter than the general federal practice. There is no direct counterpart to Military Rule of Evidence 707 in the Federal Rules of Evidence, and in civilian federal courts the admissibility of polygraph evidence is typically analyzed case by case under reliability and balancing standards, with most courts excluding it but some allowing limited use in narrow circumstances. The military chose a categorical bar instead. For a court-martial, that means the nuanced civilian debate over reliability does not control. The evidence is simply out.
What an accused can and cannot do
An accused who has obtained a favorable private polygraph cannot introduce the examiner’s opinion, the charts, or testimony that the examination happened. Counsel cannot ask a witness to relay the result, and the accused cannot testify that an independent examiner found no deception. Attempting to do so invites exclusion and can draw a curative instruction or other corrective action from the military judge.
What the accused can do is develop the underlying facts through admissible means. The same truthful account the accused hoped the polygraph would support can be presented through the accused’s own testimony, through corroborating witnesses, through documentary evidence, and through cross-examination that undermines the government’s proof. Where the defense believes a condition or circumstance explains the charged conduct, that evidence comes in on its own terms, not through the forbidden vehicle of a polygraph.
Conclusion
Third-party polygraph interpretations are not admissible in a court-martial, and the government’s decision not to conduct testing does not change that result. Military Rule of Evidence 707 bars the results, the examiner’s opinion, and any reference to a polygraph examination, without exception for privately arranged or defense-initiated tests. The Supreme Court confirmed the rule’s validity in United States v. Scheffer, holding that excluding even exculpatory polygraph evidence does not violate the accused’s right to present a defense. A service member who wants the truth before the court must establish it through traditional, admissible evidence rather than through a polygraph examiner’s reading of the charts.
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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