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Historically, to be admissible in court and to ensure maximum reliability and validity, written testimony presented in the form of an affidavit (i.e., the witness would not be appearing in court at the hearing at which the affidavit was considered as evidence) was usually witnessed by another person (in many common law jurisdictions, a notary ...
Kastigar v. United States, 406 U.S. 441 (1972), was a United States Supreme Court decision that ruled on the issue of whether the government's grant of immunity from prosecution can compel a witness to testify over an assertion of the Fifth Amendment privilege against self-incrimination.
Davis v. Washington, 547 U.S. 813 (2006), was a case decided by the Supreme Court of the United States and written by Justice Antonin Scalia that established the test used to determine whether a hearsay statement is "testimonial" for Confrontation Clause purposes.
Diaz was convicted and sentenced to seven years in prison. On appeal to the United States Court of Appeals for the Ninth Circuit, the Court rejected petitioner's argument that Agent Flood's testimony violated rule 704(b). The Court ruled that Flood's statements did not constitute an "explicit opinion" on the defendant's state of mind. [4]
Trammel v. United States, 445 U.S. 40 (1980), is a United States Supreme Court case involving the spousal privilege and its application in the law of evidence. In it, the Court held that the witness-spouse alone has a privilege to refuse to testify adversely; the witness may be neither compelled to testify nor foreclosed from testifying.
The responsibility to evaluate the credibility of eyewitness testimony falls on each individual juror, when such evidence is offered as testimony in a trial in the United States. [6] Research has shown that mock juries are often unable to distinguish between a false and accurate eyewitness testimony.
Giglio v. United States, 405 U.S. 150 (1972), is a United States Supreme Court case in which the Court held that the prosecution's failure to inform the jury that a witness had been promised not to be prosecuted in exchange for his testimony was a failure to fulfill the duty to present all material evidence to the jury, and constituted a violation of due process, requiring a new trial. [1]
The Supreme Court has not explicitly decided whether a defendant's pre-arrest silence may be introduced as substantive evidence of guilt (i.e., may be used in the government's case-in-chief, even if the defendant chooses not to testify). A three-justice plurality of the Court, in Salinas v.