Repository Collection 03
Giglio v. United States
CASE ENTRY
Last Revised • July 11, 2026
This Source Verification Page documents the United States Supreme Court decision in Giglio v. United States, cited in Claim III of the Supplemental Motion. The decision is relied upon for the constitutional principle that the prosecution's duty to disclose favorable evidence extends to material impeachment evidence affecting the credibility of government witnesses. It is included to support the allegations concerning the suppression of impeachment evidence discussed in Paragraph 123 of the Supplemental Motion.
Related SMAR Citation
“Giglio v. United States, 405 U.S. 150 (1972)”
Case Name
Giglio v. United States
Citation
405 U.S. 150 (1972)
Date
February 24, 1972
Verification Source
Official United States Supreme Court opinion located through GovInfo.
Source Location
United States Supreme Court Opinion
Highlighted Pages
1 - 4
Referenced in the Supplemental Motion
Page 60, Paragraph 123
Source Status
✔ Original United States Supreme Court opinion obtained and reviewed
✔ Relevant holding highlighted
✔ Publicly available source
✔ Included within the Source Verification Archive
Cited to Support
Lyle C. May alleges that the prosecution's constitutional duty to disclose favorable evidence extends to impeachment evidence affecting the credibility of government witnesses, including law enforcement officers. Giglio v. United States is cited to establish that promises, agreements, disciplinary history, prior misconduct, bias, or other information bearing upon the credibility of government witnesses must be disclosed to the defense when material to guilt or punishment. May relies upon Giglio as the constitutional basis for his request that the Court compel disclosure of Giglio-related impeachment material concerning law enforcement officers and other government witnesses involved in the investigation and prosecution of his Buncombe County case arising from the July 1997 murders in Asheville, North Carolina.
Supporting Documents
Original Court Opinion
Link to the original court opinion.
Highlighted Research Copy
Working research copy containing the highlighted passages cited in the Supplemental Motion.
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