United States v. Williams (1992)

United States v. Williams
Supreme Court of the United States
Argued January 22, 1992 Decided May 4, 1992
Full case name	United States, Petitioner v. John H. Williams, Jr.
Citations	504 U.S. 36 (more)
Court membership
Chief Justice William Rehnquist Associate Justices Byron White · Harry Blackmun John P. Stevens · Sandra Day O'Connor Antonin Scalia · Anthony Kennedy David Souter · Clarence Thomas
Case opinions
Majority	Scalia, joined by Rehnquist, White, Kennedy, Souter
Dissent	Stevens, joined by Blackmun, O'Connor; Thomas (parts II, III)

United States v. Williams, 504 U.S. 36 (1992), was a decision by the Supreme Court of the United States concerning the presentation of exculpatory evidence to a grand jury, ruling that the federal courts do not have the supervisory power to require prosecutors to present exculpatory evidence to the grand jury. The opinion was written by Justice Scalia, and the dissent by Justice Stevens.

The question addressed by the court, was if there were grounds for prosecutorial misconduct – which would require the dismissal of an indictment – for the prosecutor to withhold “substantial exculpatory evidence” that could lead the grand jury to reject the indictment. The significance of the ruling lies not only in its definition of the duty of the prosecutor in regard to presenting exculpatory evidence before the grand jury, but also in its definition of the grand jury's accusatory role.

The ruling protects prosecutors who withhold "substantial exculpatory evidence" in order to obtain an indictment, as the role of the grand jury is not to determine guilt, but rather to decide whether there is enough evidence of a crime; exculpatory evidence can be presented at trial. The dissent from Stevens focused on the argument that a prosecutor's failure to present substantially exculpatory evidence is a form of prosecutorial misconduct, but that nevertheless, the prosecutor need not "ferret out and present all evidence that could be used at trial to create a reasonable doubt as to defendant's guilt."