The sham affidavit doctrine is a judge-made rule that lets a court disregard a sworn statement when it flatly contradicts the same person’s earlier deposition testimony without a legitimate explanation. The remedy is exclusion: the contradictory portions of the affidavit are struck, and the summary judgment motion is decided as if those portions were never filed. If nothing else in the record supports the opposing party’s case, summary judgment goes through.
Where the Doctrine Comes From
The rule is not written into the Federal Rules of Civil Procedure. Federal courts created it, beginning with the Second Circuit’s 1969 decision in Perma Research & Development Co. v. Singer Co., which held that if a deponent could defeat summary judgment simply by filing a contradictory affidavit, the entire summary judgment procedure would be gutted.1Justia Law. Perma Research and Development Company v. The Singer Co. Summary judgment exists to filter out cases with no genuine factual dispute; the doctrine protects that filter.
The underlying premise is that a deposition is more trustworthy than an affidavit. In a deposition, opposing counsel asks follow-up questions, presses vague answers, and pins down specifics in real time. An affidavit is usually drafted by a lawyer in a controlled setting and signed at the party’s convenience. That difference in reliability is why courts give the deposition the benefit of the doubt when the two conflict without a credible explanation.2United States District Court for the Eastern District of Pennsylvania. Buttars v. City of Philadelphia – Sham Affidavit Doctrine
There is also an evidentiary wrinkle that gives the doctrine extra force. Under Federal Rule of Evidence 801(d)(1)(A), a prior statement that contradicts a declarant’s current testimony is not hearsay if it was given under penalty of perjury at a trial, hearing, deposition, or other proceeding, and the declarant is available for cross-examination.3Legal Information Institute. Federal Rules of Evidence Rule 801 – Definitions That Apply to This Article; Exclusions from Hearsay The earlier deposition does not just impeach the later affidavit; it can replace it as substantive evidence.
When a Contradictory Affidavit Is Still Allowed
The doctrine is not a blanket ban on any difference between a deposition and a later affidavit. Courts recognize two situations where a change is legitimate.
The first is clarification of ambiguous testimony. Depositions involve complex questions, imprecise phrasing, and occasional miscommunication. If you were confused by the way a question was framed and your affidavit explains what you actually meant, most courts will allow it. The Tenth Circuit in Franks v. Nimmo identified confusion during earlier testimony as a specific factor weighing against exclusion.4American Bar Association. Why the Sham Affidavit Doctrine Should Make You a Better Examiner The distinction courts draw is that a clarification fills a gap or resolves an ambiguity, while a sham affidavit rewrites the story.
The second is newly discovered evidence. If information was genuinely unavailable at the time of the deposition, an affidavit incorporating that information is not a true contradiction. The witness simply knows something now that they did not know then. You will need a convincing explanation for why the evidence surfaced late. Courts are skeptical of claims that evidence just appeared at the most convenient moment, but they will credit a good-faith explanation supported by the timeline of discovery.
How Courts Apply the Standard
The doctrine is not applied uniformly across federal courts. Some circuits take a hard line: if the affidavit contradicts the deposition, it is struck unless the explanation is airtight. Others use a totality-of-the-circumstances approach, weighing factors like whether the deponent was cross-examined, whether the earlier testimony was truly clear, and whether the affiant had access to the relevant evidence at the time of the deposition.
State courts add another layer. Many states have adopted their own versions of the doctrine, though the precise standard varies. Some state courts have explicitly warned against applying it mechanistically to reject any affidavit containing a contradiction, requiring instead that the court evaluate whether a genuine factual dispute still exists despite the discrepancy.5Justia Law. Richard Shelcusky v. Al Garjulio et als. If your case turns on this doctrine, the specific standard in your jurisdiction matters more than any general rule.
How To Raise the Objection
You do not need a separate motion to challenge an affidavit. Under Federal Rule of Civil Procedure 56(c)(2), you can simply object that the material cited to support or oppose a fact cannot be presented in admissible form. The advisory committee notes confirm that no standalone motion to strike is required.6Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment In practice, attorneys often file a separate motion to strike anyway when the problems are extensive enough to warrant detailed briefing, particularly when invoking the sham affidavit doctrine.
The mechanics on the opposing side matter too. If you need more time to gather affidavits or take discovery before responding to a summary judgment motion, Rule 56(d) lets you file a declaration explaining why you cannot yet present the necessary facts. The court can then grant additional time or permit further discovery before ruling.6Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment This is relevant because a weak affidavit sometimes reflects a party racing a deadline rather than concealing a change in story, and the court will want to understand which it is.
Related Grounds Courts Often Consider Alongside
A sham affidavit challenge targets a specific defect: a later statement that contradicts earlier sworn testimony. Other defects can take an affidavit down without any contradiction at all, and they often appear in the same motion.
Personal knowledge is the most common. Rule 56(c)(4) requires an affiant to set out facts that would be admissible in evidence and to show competence to testify on the matters stated.6Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment Federal Rule of Evidence 602 reinforces the point: a witness may testify only if there is enough evidence to support a finding of personal knowledge.7Legal Information Institute. Federal Rules of Evidence Rule 602 – Need for Personal Knowledge Statements made on “information and belief” fail the standard. The attack is different from a sham argument. You are not saying the person changed their story; you are saying they never had the firsthand knowledge to tell it.
Conclusory statements fall out for a related reason. “The defendant acted negligently” is a legal conclusion, not a factual assertion. A valid affidavit describes what happened, the sequence of events, and the observable conditions, and lets the court draw the legal conclusion. Hearsay is another frequent target: an affidavit recounting what someone else said, offered to prove the truth of that statement, is disregarded unless a Rule 803 exception applies.8Legal Information Institute. Federal Rules of Evidence Rule 802 – The Rule Against Hearsay9Legal Information Institute. Federal Rules of Evidence Rule 803 – Exceptions to the Rule Against Hearsay
Sanctions for Bad Faith Submissions
Submitting a dishonest or frivolous affidavit can cost more than having the document struck. Federal Rule of Civil Procedure 56(h) gives the court authority to order the submitting party to pay the opposing party’s reasonable expenses, including attorney’s fees, if the court finds the affidavit was submitted in bad faith or solely for delay. The offending party or attorney can also be held in contempt.6Legal Information Institute. Federal Rules of Civil Procedure Rule 56 – Summary Judgment
Rule 11 provides a separate sanctions track. An attorney who signs and files a document certifies that the factual contentions have evidentiary support. When they don’t, the court can impose sanctions ranging from monetary penalties covering the opposing party’s fees to nonmonetary consequences like mandatory continuing legal education, referral to bar disciplinary authorities, or in extreme cases, suspension from practice.10Federal Judicial Center. The Rule 11 Sanctioning Process Courts generally follow a proportionality principle, imposing the least severe sanction that will deter future misconduct. “Least severe” still has real bite when attorney’s fees in complex litigation run into six figures.
And perjury remains on the table whenever the affidavit was knowingly false. Federal perjury under 18 U.S.C. § 1621 applies to any material false statement made under oath or in a declaration under penalty of perjury, and carries a maximum sentence of five years in prison.11Office of the Law Revision Counsel. 18 USC 1621 – Perjury Generally Most sham affidavit disputes end at exclusion and fees, but the criminal exposure explains why the doctrine’s threshold question — truthful inconsistency or tactical rewrite — carries so much weight.