The Fourth Amendment to the United States Constitution is part of the Bill of Rights. It prohibits unreasonable searches and seizures and sets requirements for issuing warrants: warrants must be issued by a judge or magistrate, justified by probable cause, supported by oath or affirmation, and must particularly describe the place to be searched and the persons or things to be seized.
Wiretapping, also known as wire tapping or telephone tapping, is the monitoring of telephone and Internet-based conversations by a third party, often by covert means. The wire tap received its name because, historically, the monitoring connection was an actual electrical tap on an analog telephone or telegraph line. Legal wiretapping by a government agency is also called lawful interception. Passive wiretapping monitors or records the traffic, while active wiretapping alters or otherwise affects it.
The Omnibus Crime Control and Safe Streets Act of 1968 was legislation passed by the Congress of the United States and signed into law by President Lyndon B. Johnson that established the Law Enforcement Assistance Administration (LEAA). Title III of the Act set rules for obtaining wiretap orders in the United States. The act was a major accomplishment of Johnson's war on crime.
Fruit of the poisonous tree is a legal metaphor used to describe evidence that is obtained illegally. The logic of the terminology is that if the source of the evidence or evidence itself is tainted, then anything gained from it is tainted as well.
In the United States, the exclusionary rule is a legal rule, based on constitutional law, that prevents evidence collected or analyzed in violation of the defendant's constitutional rights from being used in a court of law. This may be considered an example of a prophylactic rule formulated by the judiciary in order to protect a constitutional right. The exclusionary rule may also, in some circumstances at least, be considered to follow directly from the constitutional language, such as the Fifth Amendment's command that no person "shall be compelled in any criminal case to be a witness against himself" and that no person "shall be deprived of life, liberty or property without due process of law."
Wolf v. Colorado, 338 U.S. 25 (1949), was a United States Supreme Court case in which the Court held 6—3 that, while the Fourth Amendment was applicable to the states, the exclusionary rule was not a necessary ingredient of the Fourth Amendment's right against warrantless and unreasonable searches and seizures. In Weeks v. United States, 232 U.S. 383 (1914), the Court held that as a matter of judicial implication the exclusionary rule was enforceable in federal courts but not derived from the explicit requirements of the Fourth Amendment. The Wolf Court decided not to incorporate the exclusionary rule as part of the Fourteenth Amendment in large part because the states which had rejected the Weeks Doctrine had not left the right to privacy without other means of protection. However, because most of the states' rules proved to be ineffective in deterrence, the Court overruled Wolf in Mapp v. Ohio, 367 U.S. 643 (1961). That landmark case made history as the exclusionary rule enforceable against the states through the Due Process clause of the Fourteenth Amendment to the same extent that it applied against the federal government.
Katz v. United States, 389 U.S. 347 (1967), was a landmark decision of the U.S. Supreme Court in which the Court redefined what constitutes a "search" or "seizure" with regard to the protections of the Fourth Amendment to the U.S. Constitution. The ruling expanded the Fourth Amendment's protections from an individual's "persons, houses, papers, and effects", as specified in the Constitution's text, to include any areas where a person has a "reasonable expectation of privacy". The reasonable expectation of privacy standard, now known as the Katz test, was formulated in a concurring opinion by Justice John Marshall Harlan II.
Admissible evidence, in a court of law, is any testimonial, documentary, or tangible evidence that may be introduced to a factfinder—usually a judge or jury—to establish or to bolster a point put forth by a party to the proceeding. For evidence to be admissible, it must be relevant and "not excluded by the rules of evidence", which generally means that it must not be unfairly prejudicial, and it must have some indicia of reliability. The general rule in evidence is that all relevant evidence is admissible and all irrelevant evidence is inadmissible, though some countries proscribe the prosecution from exploiting evidence obtained in violation of constitutional law, thereby rendering relevant evidence inadmissible. This rule of evidence is called the exclusionary rule. In the United States, this was effectuated federally in 1914 under the Supreme Court case Weeks v. United States and incorporated against the states in 1961 in the case Mapp v. Ohio. Both of these cases involved law enforcement conducting warrantless searches of the petitioners' homes, with incriminating evidence being described inside them. Consciousness of guilt is admissible evidence.
Olmstead v. United States, 277 U.S. 438 (1928), was a decision of the Supreme Court of the United States, on the matter of whether wiretapping of private telephone conversations, conducted by federal agents without a search warrant with recordings subsequently used as evidence, constituted a violation of the target’s rights under the Fourth and Fifth Amendments. In a 5–4 decision, the Court held that the constitutional rights of a wiretapping target have not been violated.
United States v. U.S. District Court, 407 U.S. 297 (1972), also known as the Keith Case, was a landmark United States Supreme Court decision that upheld, in a unanimous 8-0 ruling, the requirements of the Fourth Amendment in cases of domestic surveillance targeting a domestic threat.
The Confrontation Clause of the Sixth Amendment to the United States Constitution provides that "in all criminal prosecutions, the accused shall enjoy the right ... to be confronted with the witnesses against him." The right only applies to criminal prosecutions, not civil cases or other proceedings. Generally, the right is to have a face-to-face confrontation with witnesses who are offering testimonial evidence against the accused in the form of cross-examination during a trial. The Fourteenth Amendment makes the right to confrontation applicable to the states and not just the federal government.
Parallel construction is a law enforcement process of building a parallel, or separate, evidentiary basis for a criminal investigation in order to limit disclosure as to the origins of an investigation.
Bartnicki v. Vopper, 532 U.S. 514 (2001), is a United States Supreme Court case relieving a media defendant of liability for broadcasting a taped conversation of a labor official talking to other union members about a teachers' strike.
Berger v. New York, 388 U.S. 41 (1967), was a United States Supreme Court decision invalidating a New York law under the Fourth Amendment, because the statute authorized electronic eavesdropping without required procedural safeguards.
Silverthorne Lumber Co. v. United States, 251 U.S. 385 (1920), was a U.S. Supreme Court decision in which Silverthorne had attempted to evade paying taxes. Federal agents illegally seized tax books from Silverthorne and created copies of the records. The ruling, delivered by Oliver Wendell Holmes Jr., was that any evidence obtained, even indirectly, from an illegal search was inadmissible in court. He reasoned that otherwise, police would have an incentive to circumvent the Fourth Amendment to obtain derivatives of the illegally obtained evidence. This precedent later became known as the "fruit of the poisonous tree doctrine," and is an extension of the exclusionary rule.
SEC v. Rajaratnam, 622 F.3d 159, is a United States Court of Appeals for the Second Circuit case in which defendants Raj Rajaratnam and Danielle Chiesi appealed a discovery order issued by a district court during a civil trial against them for insider trading filed by the Securities and Exchange Commission (SEC). The district court compelled the defendants to disclose to the SEC the contents of thousands of wiretapped conversations that were originally obtained by the United States Attorney's Office (USAO) and were turned over to the defendants during a separate criminal trial.
Nix v. Williams, 467 U.S. 431 (1984), was a U.S. Supreme Court case that created an "inevitable discovery" exception to the exclusionary rule. The exclusionary rule makes most evidence gathered through violations of the Fourth Amendment to the United States Constitution, which protects against unreasonable search and seizure, inadmissible in criminal trials as "fruit of the poisonous tree". In Nix, the Court ruled that evidence that would inevitably have been discovered by law enforcement through legal means remained admissible.
Clapper v. Amnesty International USA, 568 U.S. 398 (2013), was a United States Supreme Court case in which the Court held that Amnesty International USA and others lacked standing to challenge section 702 of the Foreign Intelligence Surveillance Act of 1978, as amended by the Foreign Intelligence Surveillance Act of 1978 Amendments Act of 2008.
Elkins v. United States, 364 U.S. 206 (1960), was a US Supreme Court decision that held the "silver platter doctrine", which allowed federal prosecutors to use evidence illegally gathered by state police, to be a violation of the Fourth Amendment to the United States Constitution.
Murray v. United States, 487 U.S. 533 (1988), was a United States Supreme Court decision that created the modern "independent source doctrine" exception to the exclusionary rule. The exclusionary rule makes most evidence gathered through violations of the Fourth Amendment to the United States Constitution inadmissible in criminal trials as "fruit of the poisonous tree". In Murray, the Court ruled that when officers conduct two searches, the first unlawful and the second lawful, evidence seized during the second search is admissible if the second search "is genuinely independent of [the] earlier one."
