Perjury sounds simple, lie under oath, but the offense the government actually has to prove is narrower than the everyday meaning, and that gap is exactly where the defense works. A false statement alone is not perjury. Several specific elements must all line up, and a defense attorney handling a perjury allegation tests each one rather than arguing the witness was merely wrong.
The offense: Article 131
Perjury under the UCMJ is Article 131 (10 U.S.C. § 931). For the most common form, giving false testimony, the government must prove a stack of elements, all of them:
- The accused took an oath or affirmation in a judicial proceeding or course of justice;
- The oath was authorized or required by law in that matter;
- It was administered by a person with authority to do so;
- The accused willfully gave certain testimony;
- The testimony was material to the issue;
- The testimony was false; and
- The accused did not believe it to be true when they said it.
“Judicial proceeding” includes a trial by court-martial, and “course of justice” reaches a preliminary hearing under the UCMJ, so the offense can arise in more settings than just a trial.
Where the defense lives: materiality and belief
Two elements carry most of the defense weight, because they are the hardest for the government and the most forgiving to the accused.
- Materiality. The false statement must matter to the issue or inquiry. A misstatement about something trivial or collateral may not be material, and if it is not, the perjury charge fails even if the statement was wrong.
- Disbelief at the time. The accused must not have believed the statement was true when making it. This is the crucial line between perjury and honest error. A witness who testified to something they sincerely believed, even if it turned out to be false, has not committed perjury, because the law targets willful lying, not honest mistake or faulty memory.
This is why “handling” a perjury allegation is element-by-element work. The defense asks: Was the statement actually material? Was it really false, or just imprecise? And above all, did the accused believe it when they said it?
The practical posture
Because perjury allegations often grow out of inconsistencies in testimony, the defense frequently centers on explaining the inconsistency without conceding willful falsehood, memory differs, questions are ambiguous, and people restate things imperfectly under pressure. None of that is perjury unless the full set of elements is met.
Imagine a witness who misremembers a minor date versus one who lies about the central fact in issue: only the second, a willful, material falsehood known to be untrue, meets the perjury elements, while the first may be honest error.
The takeaway for anyone facing such an allegation is that a perjury charge is not proven by showing a statement was false; it is proven only by showing it was material, willful, and known to be untrue. That is a demanding standard, and it is the ground a defense attorney contests, which is reason enough to involve counsel before answering questions about the statement at issue.
Frequently Asked Questions
Is an honest mistake on the witness stand perjury?
No. Perjury requires that the person did not believe the statement was true when they made it. An honest error or faulty memory does not meet that standard.
Does a false statement have to be important to be perjury?
Yes. The statement must be material to the issue, so a trivial or collateral misstatement may not qualify as perjury.
Can perjury be charged for a written statement, not just live testimony?
Yes. A false, material statement made under penalty of perjury in a proceeding can also support the charge.
This article is general information about perjury under the UCMJ. It is not legal advice and does not create an attorney-client relationship. Elements and their application depend on the specific facts and can change. Anyone facing a perjury allegation should consult defense counsel.
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