Perjury in Court: What It Is, Why It Happens, and What to Do When It Happens to You

What Perjury Actually Is

Michigan law defines perjury in MCL 750.422 as willfully making a false statement in a judicial proceeding while under oath, knowing that statement to be false. Three elements must be present: the statement was made under oath or affirmation; the speaker had actual knowledge that it was false at the time they made it; and the false statement was material, meaning it had the capacity to influence the outcome of the proceeding.

The materiality requirement is not trivial. A lie that would not have changed anything in the proceeding is, legally, not perjury under the statute, however dishonest it may be. This is one reason perjury prosecutions are difficult to establish, because the prosecution must prove both that the person knew they were lying and that the lie mattered.

Perjury charges also require proof beyond a reasonable doubt, and the lie must typically be demonstrated through evidence other than the opposing party’s assertion that it happened. This is the prosecution standard. The civil standard for whether a court disbelieves testimony is different and lower, but civil disbelief has no criminal consequence for the person who lied.

Beyond the sworn testimony of witnesses, courts in Michigan also accept sworn statements in the form of affidavits, interrogatories, and declarations. False statements in these documents can also constitute perjury, because they carry the same oath requirement as live testimony. This is a point many litigants do not recognize when an opposing party submits a declaration that contains factually wrong assertions.

Why Perjury Functions as a Litigation Strategy

The strategic use of false or materially misleading testimony in civil litigation is not a secret among family law practitioners. Attorneys who handle high-conflict custody disputes, contentious divorce proceedings, and domestic violence protective order hearings regularly document the phenomenon. It functions as a strategy precisely because the enforcement gap is wide and predictable.

The strategy works on several levels. First, most civil proceedings come down to credibility: one party’s account against another’s. If a party is willing to fabricate or exaggerate, and their fabrications are not immediately refuted by documentary evidence, the judicial officer hearing the case must make a credibility determination with imperfect information. A practiced liar with a consistent story and an unprepared opposing party is a dangerous combination.

Second, false testimony shifts the litigation burden. When a party lies about financial assets, parenting history, domestic violence, or the circumstances of a contract dispute, the other party must now spend time, money, and legal resources to disprove something that should not have been asserted in the first place. This is not a bug in the system. It is a feature that strategic litigants exploit. The goal is not always to win on the lie. Sometimes the goal is to delay, exhaust, or discredit.

Family court is a particularly hospitable environment for this because the subject matter is often private, the documentation is often sparse, and the emotional stakes are high enough that exaggeration and fabrication can appear indistinguishable from genuinely traumatic but undocumented events. Allegations of abuse, neglect, substance use, and parental alienation are all areas where false testimony is both easy to deploy and difficult to immediately refute.

Strategic false testimony also targets credibility rather than just facts. A party who successfully plants doubt about an opposing litigant’s mental health, sobriety, stability, or character, even through innuendo and unsupported assertion, has changed the frame through which the judicial officer evaluates everything that follows. This is sometimes called testimony designed to impair credibility rather than establish a specific fact, and it is structurally harder to respond to than a discrete, falsifiable claim.

Attorney-Facilitated Perjury: Subornation

When an attorney coaches a client or witness to testify falsely, or when an attorney knowingly presents testimony they have reason to believe is false, the conduct crosses into subornation of perjury under MCL 750.425. It is also a violation of the Michigan Rules of Professional Conduct, specifically MRPC 3.3, which prohibits a lawyer from knowingly making false statements of fact to a tribunal and from offering evidence the lawyer knows to be false.

Subornation is difficult to prove because it requires evidence of what passed between attorney and client, often protected by privilege. However, patterns of behavior can be documented. An attorney who consistently presents the same category of fabricated testimony across multiple cases, or who encourages a client to destroy or withhold evidence, or who presents affidavits that contradict documented facts in a way that could only be explained by fabrication, is engaging in conduct that the Attorney Grievance Commission has jurisdiction to investigate.

What to Do When It Happens to You

The procedural tools available to a litigant who believes they have been lied about under oath are not dramatic, and they do not come with guaranteed outcomes. But they are real, and using them correctly matters, particularly for the record.

Cross-examination at the moment of testimony is the most immediate tool. A witness who lies under oath can be confronted with contradictory documents, prior inconsistent statements, and logistical impossibilities in the story they are telling. This is best accomplished by an attorney who has prepared, but self-represented litigants can also cross-examine if they have organized their documents and anticipated the false assertions in advance. The goal is not always to destroy the witness in the moment. The goal is to create a record that preserves the contradiction.

Documentary evidence is the strongest counter to testimonial fabrication. Bank records, text message logs, school records, medical records, employment records, and GPS or location data all have the capacity to contradict sworn testimony in ways that are difficult to dismiss. If a witness testifies that they were somewhere they were not, or that an event occurred that no record supports, the documents do not require the court to believe either party. They require the court to reconcile the testimony with facts that exist outside the proceeding.

A motion to strike false or unsupported testimony can be filed during or after a proceeding, asking the court to disregard specific sworn statements as not credible or not supported by admissible evidence. Courts are not obligated to grant these motions, but filing one creates a clear record of the objection and the grounds for it. It also signals to the judicial officer that the issue is being tracked.

A request for an adverse credibility finding is a related but distinct ask. Rather than striking the testimony, the litigant is asking the court to affirmatively find that a witness was not credible, and to note that finding in the record. Adverse credibility findings matter for appeal, for any subsequent modification proceeding, and for the weight the court gives that witness in future hearings.

A criminal referral to the county prosecutor is available in theory and rarely pursued in practice. The referral should be submitted in writing, with a formal evidence packet that includes the transcript of the false testimony, the documents that contradict it, a clear timeline, and a plain-language explanation of why each element of perjury is met. Without a well-organized packet, the referral will not move. Even with one, the odds of prosecution are low in civil matters. The referral still belongs in the file, and it still sends a message to the opposing party and their attorney that the false testimony has been documented and reported.

If an attorney is involved in facilitating the false testimony, a complaint to the Michigan Attorney Grievance Commission should be filed separately from any criminal referral. The grievance process is not fast, and it is not guaranteed to produce discipline, but it is the mechanism that exists for attorney misconduct and it creates a formal record that follows the attorney. A complaint supported by the transcript, the contradictory evidence, and a clear explanation of how the attorney’s conduct violated MRPC 3.3 is materially stronger than a complaint that consists only of the assertion that the attorney’s client lied.

Finally, preserve everything for the record on appeal. Courts of appeals review factual findings for clear error and credibility determinations with significant deference to the trial court. But if the record shows that the court accepted testimony that was contradicted by documentary evidence, that the court failed to address a motion to strike or a credibility objection, or that material false testimony shaped a ruling in a way the record cannot support, those issues are preserved and arguable. A poorly built record at the trial level is the single largest obstacle to appellate relief.

What the System Will and Will Not Do

The honest summary is this: courts are not perjury enforcement agencies. They are dispute resolution bodies. When a judicial officer concludes that a witness was not credible, they move on to the next issue. They do not send a referral letter to the prosecutor. They do not convene a disciplinary inquiry. They make a credibility finding and issue a ruling.

This is not a failure of individual judges. It is the structural logic of a docket-driven system in which perjury prosecution would require every contested civil proceeding to generate a potential criminal case. That is not a sustainable model, and courts have never operated that way.

That asymmetry is worth naming. The person who lies bears minimal institutional risk. The person who is lied about must do additional legal work, spend additional resources, and accept that the most likely outcome is a credibility finding rather than a criminal prosecution. That is the reality of how perjury functions in civil and family court in Michigan and virtually every other jurisdiction in the country.

What can change the calculus is documentation. A litigant who walks into a proceeding with organized records, clear timelines, and specific evidence that contradicts anticipated false testimony has changed the evidentiary environment in which the lie will be evaluated. The lie still happens. But the record that follows it looks very different.