A Federal Criminal Law Resource — Written by a Cornell University Honors Graduate

Federal Perjury and False Statements — 18 U.S.C. §§ 1621, 1623, and 1001

The broadest prosecutorial tool: false statements to federal agents

John Kirby
By John Kirby
Federal Criminal Defense Attorney • Arizona • California • Federal Courts Nationwide
2026-07-03

Federal perjury and false statements are serious crimes that can lead to severe penalties. These offenses typically arise when someone knowingly makes a false statement under oath or provides misleading information during an official investigation by a federal agency. The legal repercussions of such actions can be far-reaching, affecting not only the individual involved but also potentially impacting their families and careers.

Perjury Before a Court or Grand Jury: 18 U.S.C. §§ 1621 & 1623

The crimes of perjury under 18 U.S.C. § 1621 and false declarations under 18 U.S.C. § 1623 are closely related but distinct. Both involve knowingly making a false statement while under oath, yet each statute has unique elements that prosecutors must prove to secure a conviction.

The Two-Witness Rule and Materiality After United States v. Gaudin

In federal perjury cases, one of the key legal defenses has been the two-witness rule, which requires at least two witnesses who heard the alleged false statement for it to be admissible in court. However, this traditional protection was weakened by the Supreme Court's decision in United States v. Gaudin, 515 U.S. 506 (1995), which held that the materiality of a perjurious statement is an issue for the judge to decide, not the jury.

Federal False Statements: 18 U.S.C. § 1001 — The 'Go Directly to Jail' Statute

The broadest and most frequently used statute for prosecuting false statements is 18 U.S.C. § 1001, often referred to as the 'go directly to jail' statute due to its wide applicability and severe penalties. This law applies when someone knowingly and willfully falsifies or conceals a material fact in any matter within the jurisdiction of the federal government.

The 'Exculpatory No' Doctrine: When Denials Aren't Enough to Trigger Liability

One significant defense against false statements charges is known as the 'exculpatory no.' This doctrine suggests that a denial of wrongdoing, without more, does not constitute a material statement under 18 U.S.C. § 1001.

Obstruction of Justice Enhancement at 3C1.1: Penalties for Interfering with Investigations

The Sentencing Guidelines provide an enhancement to sentences if a defendant's actions are found to obstruct justice. This is particularly relevant in cases involving perjury and false statements, as these crimes can be seen as attempts to interfere with or impede official investigations.

Practical Implications and Common Defense Considerations

In navigating charges related to federal perjury and false statements, defendants often face complex legal challenges. Key considerations include:

The defense against federal perjury and false statements charges requires a nuanced understanding of both statutory law and case precedents. Defendants and their legal teams must carefully assess each element of the crime to craft effective strategies that can challenge the prosecution's burden of proof.

John Kirby
John Kirby
Cornell University Honors Graduate • Federal Criminal Defense Attorney
Licensed in Arizona, California, and federal courts nationwide. Decades of federal criminal defense experience. For direct representation, contact Kirby Criminal Law.

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