Also known as:collateral matters · collateral issue
Written by attorneys — see sources below.
A fact or circumstance that bears only indirectly on the central issues in a case or on a witness's credibility. Extrinsic evidence is generally inadmissible to contradict a witness on such a point.
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How its tested
Common Examples
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Consent Induced by Collateral Fraud
Cedar Creek Farms obtained permission from neighbor Claire Campbell to enter her land and inspect a shared fence line. The farm's agent falsely claimed the visit would last only ten minutes when the true purpose was to test soil samples for an unrelated project. Campbell later sued for trespass. Because the misrepresentation concerned only a collateral detail about duration and not the essential character of the entry, the consent remained valid and the trespass claim failed.
Impeachment with Suppressed Evidence
Caleb Chang testified on direct that he had never possessed the drugs found in his car. The government sought to impeach him with a prior statement obtained in violation of his rights that directly contradicted that testimony. The court permitted the impeachment because the inconsistency went to the heart of the charged offense and was not limited to a collateral matter.
Respondent James Havens, an attorney from Fort Wayne, Indiana, and John McLeroth boarded a flight from Lima, Peru, to Miami, Florida.
Upon arrival in Miami, customs officers searched McLeroth and discovered cocaine sewn into makeshift pockets in a T-shirt he wore under his outer clothing. McLeroth implicated Havens, who had already cleared customs and was arrested. Officers seized and searched Havens' luggage without a warrant, finding a T-shirt with pieces cut out that matched those sewn onto McLeroth's T-shirt. The T-shirt and other items from the search were suppressed before trial on Havens' motion.
Both men were charged in a three-count indictment. McLeroth pleaded guilty to one count and testified against Havens at trial, stating that Havens had supplied the altered T-shirt and sewed the pockets shut. Havens took the stand in his defense and denied any involvement in smuggling cocaine. On direct examination, Havens testified that he did not engage in wrapping or taping activities with McLeroth.
During cross-examination, the government asked Havens whether he had a size 38-40 medium T-shirt with swatches missing in his luggage when passing through customs, and Havens denied it. On rebuttal, a government agent testified that the T-shirt had been found in Havens' suitcase and that Havens had claimed the T-shirts belonged to McLeroth. The T-shirt was admitted into evidence over objection, with the jury instructed to consider it only for impeaching Havens' credibility. Havens was convicted of importing, conspiring to import, and intentionally possessing cocaine. The Court of Appeals for the Fifth Circuit reversed the conviction. The Supreme Court granted certiorari.
Christine Castro took the stand and denied making any incriminating admissions to police. The prosecution introduced her earlier statements for impeachment even though those statements had been obtained without proper warnings. The court allowed the use because the statements contradicted her direct testimony on a material point rather than a collateral detail.
Harris v. New York401 U.S. 222 (1971)
The State of New York charged petitioner Harris in a two-count indictment with twice selling heroin to an undercover police officer on January 4 and January 6, 1966. At the jury trial, the undercover officer testified as to the details of the two sales, a second officer verified collateral details, and a third offered testimony about the chemical analysis of the heroin.
Petitioner Harris took the stand in his own defense. He admitted knowing the undercover police officer but denied a sale on January 4. He admitted making a sale of the contents of a glassine bag to the officer on January 6 but claimed it was baking powder and part of a scheme to defraud the purchaser.
On cross-examination, petitioner was asked whether he had made specified statements to the police immediately following his arrest on January 7 that partially contradicted his direct testimony. In response, petitioner testified that he could not remember virtually any of the questions or answers recited by the prosecutor. At the request of petitioner’s counsel, the written statement was placed in the record for possible use on appeal but was not shown to the jury.
The trial judge instructed the jury that the statements attributed to petitioner could be considered only in passing on his credibility and not as evidence of guilt. The jury found petitioner guilty on the second count of the indictment. The New York Court of Appeals affirmed the conviction in a per curiam opinion.
The prosecution made no effort in its case in chief to use the statements. The prosecution conceded they were inadmissible under Miranda because no warning of a right to appointed counsel was given before questions were put to petitioner when taken into custody. Petitioner made no claim that the statements were coerced or involuntary. The Supreme Court granted the writ to consider whether such a statement may be used to impeach the petitioner’s credibility.
Police seized documents from Carmen Choi's home without a warrant. At trial the government could not introduce the documents in its case in chief. When Choi testified to facts directly contradicted by the seized papers, the court permitted limited impeachment use because the contradiction was not confined to a collateral matter.
Weeks v. United States232 U.S. 383 (1914)
In December 1911 a federal indictment containing nine counts was returned against the defendant in the District Court of the United States for the Western District of Missouri. The seventh count charged use of the mails to transport lottery coupons or tickets in violation of section 213 of the Criminal Code.
The defendant was arrested without a warrant by a police officer at the Union Station in Kansas City, Missouri, where he was employed by an express company. On the same day other police officers went to the defendant's home at 1834 Penn Street, obtained the key from a neighbor, entered the house, searched the defendant's room, and seized papers and articles that were later turned over to the United States Marshal. Later the same day the Marshal, accompanied by police officers, returned to the house, was admitted by a boarder, searched the defendant's room, and removed letters and envelopes from a chiffonier drawer. Neither the police officers nor the Marshal possessed a search warrant.
Before trial the defendant filed a verified petition seeking return of the seized property, asserting that the seizure violated the Fourth and Fifth Amendments. The district court ordered return of property it deemed not pertinent to the charge but retained the remainder, which the government stated would be used in evidence. After the jury was sworn the defendant renewed the petition, which the court again denied. At trial the defendant objected to introduction of the retained papers on Fourth and Fifth Amendment grounds, the objection was overruled, and the papers—including lottery tickets seized by the police and letters seized by the Marshal—were admitted into evidence.
The defendant was convicted on the seventh count and sentenced to fine and imprisonment. He then prosecuted a writ of error to the Supreme Court of the United States, assigning as error the refusal to return the property and the admission of the seized papers at trial.
When may extrinsic evidence be used to contradict a witness on a prior inconsistent statement?
Extrinsic evidence is permitted only when the inconsistency concerns a non-collateral matter that is relevant to the issues in the case. If the point is purely collateral, the cross-examiner must accept the witness's answer and cannot introduce other witnesses or documents to prove the contradiction.
Does bias evidence count as a collateral matter that limits impeachment?
No. Evidence showing a witness's bias or motive to favor one side is treated as directly relevant to credibility and is not considered collateral. Courts routinely allow cross-examination on such matters even when they do not touch the substantive facts of the case.
How does the collateral-matter rule interact with the exclusionary rule in criminal cases?
Evidence that is inadmissible in the prosecution's case in chief because of a constitutional violation may still be used to impeach a defendant who testifies inconsistently, provided the inconsistency is not limited to a collateral matter. The rule prevents defendants from using the exclusionary rule as a shield for perjury on material points.
401 U.S. 222 (1971)
…on the Government’s disability to challenge his credibility.” 347 U. S., at 65. It is true that Walder was impeached as to collateral matters included in his direct examination, whereas petitioner here was impeached as to testimony bearing more directly on the crimes charged. We are not persuaded that there is a difference in…