Repository Collection 03
Kyles v. Whitley
CASE ENTRY
Last Revised • July 10, 2026
This Source Verification Page documents the United States Supreme Court's decision in Kyles v. Whitley, cited in Claim II of the Supplemental Motion. The opinion establishes that the materiality of suppressed evidence under Brady must be evaluated cumulatively rather than item by item when determining whether the suppression deprived a defendant of a fair trial.
Related SMAR Citation
“In Kyles v. Whitley, 514 U.S. 419 (1995), the Court held that to determine whether evidence not disclosed by the state was "material" for purposes of Brady, the cumulative effect of all suppressed evidence is considered, rather than considering each item of evidence individually, and whether the favorable evidence would have made a different result "reasonably probable" in the prosecution”
Case Name
Kyles v. Whitley
Citation
514 U.S. 419 (1995)
Date
April 19, 1995
Verification Source
Official United States Supreme Court opinion
Source Location
United States Supreme Court Opinion
Highlighted Pages
419 - 420, 434, 436
Referenced in the Supplemental Motion
Page 56, Paragraph: 117
✔ Original Court Order obtained and reviewed.
✔ Relevant passages highlighted.
✔ Publicly available source
✔ Included within the Source Verification Archive
May's allegation that the materiality of suppressed evidence under Brady must be evaluated by
considering the cumulative effect of all favorable evidence withheld by the State, rather than
assessing each item individually. May cites Kyles v. Whitley to support the principle that
suppressed evidence is material when, viewed collectively, there is a reasonable probability that
its disclosure would have produced a different result or undermined confidence in the outcome of
the trial. May relies upon this authority to argue that the cumulative effect of the suppressed
impeachment evidence, excluded testimony, and undisclosed investigative information described
throughout the SMAR deprived the Defendant of a fair trial.
Link to the original article.
Working research copy containing the highlighted passages cited in the Supplemental Motion.
Continue browsing the sources cited throughout Claim II.
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Source Status
Cited to Support
Supporting Documents
Original Article
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