Legal Disclaimer: This article provides general legal information about the Uniform Code of Military Justice. It is not legal advice and does not create an attorney-client relationship. Every case involves unique facts and circumstances. If you are facing charges under the UCMJ, consult with a qualified military defense attorney immediately.
Both obstruction of justice and perjury involve undermining the administration of justice, but they target different conduct. Perjury under Article 131 specifically addresses lying under oath in official proceedings. Obstruction of justice under Article 134 addresses a broader range of conduct designed to impede investigations or judicial proceedings, including witness tampering, evidence destruction, and interference with authorities. Understanding this distinction matters because the same course of conduct might involve both offenses, or might clearly fall under one but not the other.
The Scope Distinction
Article 131 Perjury is narrow and specific:
Requires a lawful oath
Requires a false statement
Requires the statement to be material to the proceeding
Focuses solely on lying under oath
Article 134 Obstruction of Justice is broad and varied:
Covers any conduct intended to impede justice
Includes evidence tampering, witness intimidation, false statements to investigators
Doesn’t require an oath
Encompasses the entire range of interference with investigations and proceedings
Perjury is one specific way to obstruct justice (lying under oath). Obstruction includes perjury plus many other forms of interference.
Article 131: Perjury Elements
Perjury requires:
Lawful oath. A valid oath administered by someone with authority.
Competent tribunal or proceeding. The oath must be in a proper official context.
False statement. The witness made an untrue statement.
Knowledge of falsity. The witness knew the statement was false.
Materiality. The false statement was relevant to the matter being decided.
The focus is entirely on sworn testimony. Without an oath, there’s no perjury, regardless of how false or damaging the statement.
Article 134: Obstruction Elements
Obstruction of justice under Article 134 requires:
Conduct. An act or course of conduct by the accused.
Intent to influence, impede, or obstruct. The conduct was designed to interfere with justice.
Pending or prospective proceeding. A criminal investigation, trial, or similar proceeding was ongoing or anticipated.
Prejudice or discredit. The conduct was prejudicial to good order and discipline or service-discrediting.
The forms of obstruction are varied:
Tampering with evidence (destroying, hiding, altering)
Intimidating or influencing witnesses
Making false statements to investigators (even without oath)
Helping suspects evade apprehension
Interfering with arrest or investigation
When Both Apply
Some conduct might constitute both offenses:
Lying under oath to protect someone. A witness commits perjury (false sworn testimony) with the intent to obstruct justice (help the defendant escape conviction). Both charges apply.
False testimony plus evidence destruction. Someone destroys evidence (obstruction) and later lies about it under oath (perjury). Two separate acts, two separate offenses.
However, the offenses often don’t overlap:
Lying to investigators (no oath). This is obstruction, not perjury, because no oath was involved.
Destroying evidence. This is obstruction but can’t be perjury because no testimony is involved.
Truthful testimony that omits information. Might be obstruction if the omission was designed to impede justice, but technically not perjury if no affirmative false statement was made.
Typical Fact Patterns
Clear perjury:
At a court-martial, a witness testifies under oath that she did not see the accused strike the victim. In fact, she clearly witnessed the assault. Her false sworn testimony is perjury.
During an Article 32 hearing, a witness falsely denies knowing the accused possessed drugs. The sworn false statement is perjury.
Clear obstruction (not perjury):
A service member learns that CID is investigating a friend for larceny. She destroys text messages that would implicate the friend. No oath is involved, but she’s intentionally impeding the investigation. This is obstruction.
A service member threatens a potential witness: “If you testify against my buddy, I’ll make your life miserable.” Witness intimidation is obstruction, not perjury.
A service member lies to investigators during an informal interview (no oath) about what he observed. False statements to investigators without oath is obstruction, not perjury.
Both offenses:
A service member destroys evidence of a friend’s misconduct (obstruction). Later, when called to testify at a court-martial under oath, she falsely denies knowledge of any evidence (perjury). Two separate acts supporting two separate charges.
The Oath Requirement
The oath requirement is the clearest distinction:
Perjury requires an oath. No oath, no perjury. Period.
Obstruction doesn’t require an oath. Unsworn lies, evidence destruction, witness tampering, and other interference all constitute obstruction regardless of whether any oath was involved.
This means many forms of obstructing justice aren’t perjury:
Lying to commanders during investigations (typically no oath)
Lying to military police (typically no oath)
Destroying or hiding evidence
Warning suspects that they’re under investigation
Helping someone evade apprehension
All of these are obstruction, none are perjury.
Punishment Comparison
Article 131 (Perjury):
Dishonorable discharge, forfeiture of all pay and allowances, confinement for 5 years
Article 134 (Obstruction of Justice):
Dishonorable discharge, forfeiture of all pay and allowances, confinement for 5 years
The maximum punishments are identical, reflecting the equal seriousness of both offenses. Both undermine the justice system, just through different means.
The Materiality Difference
Perjury requires that the false statement be “material” to the proceeding. Immaterial lies under oath technically aren’t perjury.
Obstruction has no such materiality requirement. Any act intended to impede justice can be obstruction, regardless of whether it would have actually affected the outcome.
This means:
A trivial lie under oath about a collateral matter: Possibly not perjury (not material)
A trivial act intended to impede an investigation: Still obstruction if done with that intent
False Statements to Investigators
One common scenario deserves special attention: lying to investigators.
During informal interviews. When investigators question someone without placing them under oath, false statements are obstruction (Article 134), not perjury. They may also be false official statements (Article 107).
During sworn statements. If the investigator administers an oath and obtains a sworn statement, false statements become perjury (Article 131) in addition to obstruction.
The presence or absence of an oath determines which article applies for the lying itself. But regardless of oath, lying to impede an investigation is also obstruction.
Defenses
For perjury:
The statement was true
No oath was administered
The statement wasn’t material
The accused didn’t know the statement was false
The proceeding wasn’t competent to receive sworn testimony
For obstruction:
No intent to impede justice (conduct wasn’t designed to interfere)
No pending or prospective proceeding
The conduct didn’t actually constitute obstruction
The conduct wasn’t prejudicial or service-discrediting
Exercise of legal rights (refusing to testify under Fifth Amendment isn’t obstruction)
The Right to Remain Silent
An important note: exercising your right to remain silent isn’t obstruction.
You have the right under Article 31 (and the Fifth Amendment) to refuse to answer questions that might incriminate you. Exercising this right isn’t obstruction, perjury, or any other offense.
However:
Actively lying (even without oath) can be obstruction
Destroying evidence isn’t protected speech
Intimidating witnesses isn’t protected conduct
The protection is for silence and refusal to participate, not for active interference.
Sequential Offenses
Many cases involve obstruction followed by perjury:
Phase 1: During investigation, suspect destroys evidence and makes false unsworn statements. (Obstruction)
Phase 2: At trial, suspect testifies falsely under oath about the same matters. (Perjury)
Both charges can proceed because they address different conduct at different times. The earlier obstruction didn’t require an oath; the later perjury did.
Impact on Underlying Cases
Both offenses can compound the accused’s problems:
Additional charges. Obstruction or perjury adds to whatever underlying offense was being investigated.
Sentencing enhancement. Evidence of cover-up efforts reflects poorly on the accused’s character.
Credibility destruction. Once caught lying or obstructing, the accused’s credibility in all matters is damaged.
Potential separate prosecution. Even if acquitted of the underlying offense, obstruction and perjury charges can proceed independently.
The cover-up often becomes worse than the original offense.
Frequently Asked Questions
If I lie to military police during questioning but I’m not under oath, can I still be charged with a crime?
Yes. While you can’t be charged with perjury (no oath), you can be charged with obstruction of justice under Article 134 if your lie was intended to impede an investigation. You can also be charged with making a false official statement under Article 107 because the interview is an official matter. You have the right to remain silent under Article 31. If you’re suspected of wrongdoing, you should exercise that right rather than lying. Lying creates additional criminal exposure beyond whatever you’re being investigated for. The absence of an oath doesn’t make false statements legal; it just changes which article applies.
What’s the difference between obstruction of justice and being an accessory after the fact?
Both involve helping someone avoid consequences for their crimes, but they’re conceptually distinct. Obstruction focuses on impeding the investigation or judicial process itself: destroying evidence, intimidating witnesses, lying to investigators. Accessory after the fact under Article 78 focuses on helping the offender personally: hiding them, helping them escape, providing false alibis. There’s overlap (helping someone hide can impede investigation), but the focus differs. Some conduct might support charges under both articles. The distinction matters primarily for charging decisions and how the offense is framed, but both carry serious consequences.
Can I be charged with obstruction for telling a friend they’re under investigation?
Potentially, yes. Warning someone that they’re under investigation, with intent to help them evade justice (flee, destroy evidence, create alibis), can constitute obstruction. The intent matters: innocently mentioning that you heard someone was being investigated is different from deliberately warning them so they can take evasive action. Factors courts consider include: your relationship to the suspect, how you learned about the investigation, what you told them, what they did after you warned them, and whether you intended to help them avoid consequences. If your warning enabled evidence destruction or flight, you may face obstruction charges regardless of your subjective intent.