United States v. Leon

Holding that when a warrant is "subsequently invalidated," suppression is not necessary so long as the warrant was issued by a neutral magistrate and the officers' reliance on the warrant was objectively reasonable

Franks v. Delaware

Holding that "the defendant is entitled, under the Fourth and Fourteenth Amendments, to his hearing" if he makes the required preliminary showing

United States v. Gypsum Co.

Holding that oral testimony in conflict with contemporaneous documentary evidence deserves little weight

County of Los Angeles v. Davis

Holding that voluntary cessation can render an issue moot if “there is no reasonable expectation ... that the alleged violation will recur”

Scott v. United States

Holding “the fact that the officer does not have the state of mind which is hypothecated by the reasons which provide the legal justification for the officer's action does not invalidate the action taken as long as the circumstances, viewed objectively, justify that action.”

Arizona v. Evans

Holding that good faith exception was met where police reasonably relied on erroneous information concerning an arrest warrant in a database maintained by judicial employees

United States v. United States District Court

Holding that no warrant exception existed for "domestic security" surveillance but explicitly stating that the Court had "not addressed, and express[ed] no opinion as to, the issues which may be involved with respect to activities of foreign powers or their agents"

Central Intelligence Agency v. Sims

Holding that an earlier version of the relevant National Security Act provision "qualifies as a withholding statute under Exemption 3"

U.S. v. Salameh

Holding that photographs were properly admitted to establish relationship among conspirators

U.S. v. Garcia

Holding that a district court abused its discretion in admitting a police officer's opinion "reached in the course of his investigation" as lay testimony, because, although the officer may have personally investigated the conspiracy in question, he based his opinion of the facts he observed on "his specialized training and experience"

Section 371 - Conspiracy to commit offense or to defraud United States

Requiring proof of an "act to effect the object of the conspiracy"

Section 1001 - Statements or entries generally

Making false statements

Section 2339B - Providing material support or resources to designated foreign terrorist organizations

Clarifying the scope of “personnel”

Section 956 - Conspiracy to kill, kidnap, maim, or injure persons or damage property in a foreign country

Imposing punishment where a conspirator "commits an act within the jurisdiction of the United States to effect any object of the conspiracy"

Section 2339A - Providing material support to terrorists

Defining “ ‘material support or resources' ” as “any property, tangible or intangible ”

Section 1801 - Definitions

Defining "United States person" to be a "citizen of the United States, an alien lawfully admitted for permanent residence" or certain unincorporated associations or corporations with ties to the United States

Section 1806 - Use of information

Allowing in camera , ex parte review of the legality of electronic surveillance under FISA Subchapter I if "the Attorney General files an affidavit under oath that disclosure or an adversary hearing would harm the national security of the United States"

Section 1804 - Applications for court orders

Authorizing electronic surveillance under FISA

Section 1805 - Issuance of order

Requiring "probable cause to believe . . . the target of the electronic surveillance is a foreign power or an agent of a foreign power"

Section 1803 - Designation of judges